121021221022212 has 144 divisors (see below), whose sum is σ = 330383109692160. Its totient is φ = 34377886363968.

The previous prime is 121021221022187. The next prime is 121021221022213. The reversal of 121021221022212 is 212220122120121.

It is a super-2 number, since 2×121021221022212² (a number of 29 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (121021221022213) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 576991863 + ... + 577201569.

It is an arithmetic number, because the mean of its divisors is an integer number (2294327150640).

Almost surely, 2^{121021221022212} is an apocalyptic number.

121021221022212 is a gapful number since it is divisible by the number (12) 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 121021221022212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (165191554846080).

121021221022212 is an abundant number, since it is smaller than the sum of its proper divisors (209361888669948).

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

121021221022212 is a wasteful number, since it uses less digits than its factorization.

121021221022212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 215390 (or 215381 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 21.

Adding to 121021221022212 its reverse (212220122120121), we get a palindrome (333241343142333).

The spelling of 121021221022212 in words is "one hundred twenty-one trillion, twenty-one billion, two hundred twenty-one million, twenty-two thousand, two hundred twelve".