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BaseRepresentation
bin11011100011111111000001…
…101010110100001101101000
3120220012112021222022001112110
4123203333001222310031220
5111342032241433042413
61105451430022442320
734350602234354310
oct3343770152641550
9526175258261473
10121220111221608
1135696184645803
1211719329b933a0
1352840134616b9
1421d1128552440
15e0332ec2b8c3
hex6e3fc1ab4368

121220111221608 has 128 divisors (see below), whose sum is σ = 349936381105920. Its totient is φ = 34275043123200.

The previous prime is 121220111221607. The next prime is 121220111221633. The reversal of 121220111221608 is 806122111022121.

It is a super-2 number, since 2×1212201112216082 (a number of 29 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (121220111221607) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 260063158 + ... + 260528858.

It is an arithmetic number, because the mean of its divisors is an integer number (2733877977390).

Almost surely, 2121220111221608 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 121220111221608, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (174968190552960).

121220111221608 is an abundant number, since it is smaller than the sum of its proper divisors (228716269884312).

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

121220111221608 is a wasteful number, since it uses less digits than its factorization.

121220111221608 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 481787 (or 481783 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 30.

Adding to 121220111221608 its reverse (806122111022121), we get a palindrome (927342222243729).

The spelling of 121220111221608 in words is "one hundred twenty-one trillion, two hundred twenty billion, one hundred eleven million, two hundred twenty-one thousand, six hundred eight".