78912021212 has 48 divisors (see below), whose sum is σ = 149869074432. Its totient is φ = 36258425280.

The previous prime is 78912021179. The next prime is 78912021311. The reversal of 78912021212 is 21212021987.

It is a congruent number.

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, 77813 + ... + 404819.

It is an arithmetic number, because the mean of its divisors is an integer number (3122272384).

Almost surely, 2^78912021212 is an apocalyptic number.

It is an amenable number.

78912021212 is a deficient number, since it is larger than the sum of its proper divisors (70957053220).

78912021212 is a wasteful number, since it uses less digits than its factorization.

78912021212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 327138 (or 327136 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 35.

The spelling of 78912021212 in words is "seventy-eight billion, nine hundred twelve million, twenty-one thousand, two hundred twelve".