121891952188 has 12 divisors (see below), whose sum is σ = 213511592560. Its totient is φ = 60888640032.

The previous prime is 121891952183. The next prime is 121891952239. The reversal of 121891952188 is 881259198121.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121891952183) 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, 14329233 + ... + 14337736.

Almost surely, 2^121891952188 is an apocalyptic number.

It is an amenable number.

121891952188 is a deficient number, since it is larger than the sum of its proper divisors (91619640372).

121891952188 is a wasteful number, since it uses less digits than its factorization.

121891952188 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28668036 (or 28668034 counting only the distinct ones).

The product of its digits is 829440, while the sum is 55.

The spelling of 121891952188 in words is "one hundred twenty-one billion, eight hundred ninety-one million, nine hundred fifty-two thousand, one hundred eighty-eight".