121690889928 has 48 divisors (see below), whose sum is σ = 337244141520. Its totient is φ = 39620288736.

The previous prime is 121690889909. The next prime is 121690890007. The reversal of 121690889928 is 829988096121.

It is a super-2 number, since 2×121690889928² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19649826 + ... + 19656017.

It is an arithmetic number, because the mean of its divisors is an integer number (7025919615).

Almost surely, 2^121690889928 is an apocalyptic number.

121690889928 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

121690889928 is an abundant number, since it is smaller than the sum of its proper divisors (215553251592).

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

121690889928 is a wasteful number, since it uses less digits than its factorization.

121690889928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39305898 (or 39305891 counting only the distinct ones).

The product of its (nonzero) digits is 8957952, while the sum is 63.

The spelling of 121690889928 in words is "one hundred twenty-one billion, six hundred ninety million, eight hundred eighty-nine thousand, nine hundred twenty-eight".