121355432256 has 28 divisors (see below), whose sum is σ = 321086248352. Its totient is φ = 40451810688.

The previous prime is 121355432189. The next prime is 121355432257. The reversal of 121355432256 is 652234553121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121355432257) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 316029580 + ... + 316029963.

Almost surely, 2^121355432256 is an apocalyptic number.

121355432256 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

121355432256 is an abundant number, since it is smaller than the sum of its proper divisors (199730816096).

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

121355432256 is an equidigital number, since it uses as much as digits as its factorization.

121355432256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 632059558 (or 632059548 counting only the distinct ones).

The product of its digits is 216000, while the sum is 39.

Adding to 121355432256 its reverse (652234553121), we get a palindrome (773589985377).

The spelling of 121355432256 in words is "one hundred twenty-one billion, three hundred fifty-five million, four hundred thirty-two thousand, two hundred fifty-six".