121390556 has 12 divisors (see below), whose sum is σ = 242781168. Its totient is φ = 52024512.

The previous prime is 121390457. The next prime is 121390559. The reversal of 121390556 is 655093121.

121390556 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121390559) 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, 2167661 + ... + 2167716.

It is an arithmetic number, because the mean of its divisors is an integer number (20231764).

Almost surely, 2^121390556 is an apocalyptic number.

It is an amenable number.

121390556 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

121390556 is a wasteful number, since it uses less digits than its factorization.

121390556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4335388 (or 4335386 counting only the distinct ones).

The product of its (nonzero) digits is 8100, while the sum is 32.

The square root of 121390556 is about 11017.7382433964. The cubic root of 121390556 is about 495.1403282041.

The spelling of 121390556 in words is "one hundred twenty-one million, three hundred ninety thousand, five hundred fifty-six".