121902187896 has 32 divisors (see below), whose sum is σ = 338617189200. Its totient is φ = 40634062560.

The previous prime is 121902187879. The next prime is 121902187919. The reversal of 121902187896 is 698781209121.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 282180775 + ... + 282181206.

Almost surely, 2^121902187896 is an apocalyptic number.

It is an amenable number.

121902187896 is an abundant number, since it is smaller than the sum of its proper divisors (216715001304).

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

121902187896 is a wasteful number, since it uses less digits than its factorization.

121902187896 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 564361996 (or 564361986 counting only the distinct ones).

The product of its (nonzero) digits is 870912, while the sum is 54.

The spelling of 121902187896 in words is "one hundred twenty-one billion, nine hundred two million, one hundred eighty-seven thousand, eight hundred ninety-six".