121257606990 has 64 divisors (see below), whose sum is σ = 316279656000. Its totient is φ = 29574180864.

The previous prime is 121257606983. The next prime is 121257607001. The reversal of 121257606990 is 99606752121.

It is a Curzon number.

It is a congruent number.

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, 1383715 + ... + 1468734.

It is an arithmetic number, because the mean of its divisors is an integer number (4941869625).

Almost surely, 2^121257606990 is an apocalyptic number.

121257606990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

121257606990 is an abundant number, since it is smaller than the sum of its proper divisors (195022049010).

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

121257606990 is a wasteful number, since it uses less digits than its factorization.

121257606990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2852581.

The product of its (nonzero) digits is 408240, while the sum is 48.

The spelling of 121257606990 in words is "one hundred twenty-one billion, two hundred fifty-seven million, six hundred six thousand, nine hundred ninety".