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121220111221000 = 235311210117595639
BaseRepresentation
bin11011100011111111000001…
…101010110100000100001000
3120220012112021222022000200221
4123203333001222310010020
5111342032241433033000
61105451430022435424
734350602234352451
oct3343770152640410
9526175258260627
10121220111221000
1135696184645300
1211719329b92b74
13528401346133c
1421d1128552128
15e0332ec2b61a
hex6e3fc1ab4108

121220111221000 has 384 divisors, whose sum is σ = 315108009216000. Its totient is φ = 43611057600000.

The previous prime is 121220111220983. The next prime is 121220111221007. The reversal of 121220111221000 is 122111022121.

It is a super-2 number, since 2×1212201112210002 (a number of 29 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (121220111221007) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 21496736181 + ... + 21496741819.

It is an arithmetic number, because the mean of its divisors is an integer number (820593774000).

Almost surely, 2121220111221000 is an apocalyptic number.

121220111221000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 121220111221000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (157554004608000).

121220111221000 is an abundant number, since it is smaller than the sum of its proper divisors (193887897995000).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121220111221000 is a wasteful number, since it uses less digits than its factorization.

121220111221000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7542 (or 7517 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 121220111221000 its reverse (122111022121), we get a palindrome (121342222243121).

The spelling of 121220111221000 in words is "one hundred twenty-one trillion, two hundred twenty billion, one hundred eleven million, two hundred twenty-one thousand".