121697651908 has 48 divisors (see below), whose sum is σ = 244579313664. Its totient is φ = 51902635680.

The previous prime is 121697651863. The next prime is 121697651939. The reversal of 121697651908 is 809156796121.

It is a happy number.

It is a Smith number, since the sum of its digits (55) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27144235 + ... + 27148717.

It is an arithmetic number, because the mean of its divisors is an integer number (5095402368).

Almost surely, 2^121697651908 is an apocalyptic number.

It is an amenable number.

121697651908 is an abundant number, since it is smaller than the sum of its proper divisors (122881661756).

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

121697651908 is a wasteful number, since it uses less digits than its factorization.

121697651908 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8992 (or 8990 counting only the distinct ones).

The product of its (nonzero) digits is 1632960, while the sum is 55.

The spelling of 121697651908 in words is "one hundred twenty-one billion, six hundred ninety-seven million, six hundred fifty-one thousand, nine hundred eight".