121031642256 has 160 divisors (see below), whose sum is σ = 378571984128. Its totient is φ = 32527319040.

The previous prime is 121031642209. The next prime is 121031642267. The reversal of 121031642256 is 652246130121.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11721576 + ... + 11731896.

Almost surely, 2^121031642256 is an apocalyptic number.

121031642256 is a gapful number since it is divisible by the number (16) 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 121031642256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (189285992064).

121031642256 is an abundant number, since it is smaller than the sum of its proper divisors (257540341872).

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

121031642256 is a wasteful number, since it uses less digits than its factorization.

121031642256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12409 (or 12403 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 33.

Adding to 121031642256 its reverse (652246130121), we get a palindrome (773277772377).

The spelling of 121031642256 in words is "one hundred twenty-one billion, thirty-one million, six hundred forty-two thousand, two hundred fifty-six".