21112665504312 has 32 divisors (see below), whose sum is σ = 52784935171200. Its totient is φ = 7037118980064.

The previous prime is 21112665504223. The next prime is 21112665504379. The reversal of 21112665504312 is 21340556621112.

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, 26866348 + ... + 27641019.

It is an arithmetic number, because the mean of its divisors is an integer number (1649529224100).

Almost surely, 2^{21112665504312} is an apocalyptic number.

It is an amenable number.

21112665504312 is an abundant number, since it is smaller than the sum of its proper divisors (31672269666888).

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

21112665504312 is a wasteful number, since it uses less digits than its factorization.

21112665504312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54523515 (or 54523511 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 39.

The spelling of 21112665504312 in words is "twenty-one trillion, one hundred twelve billion, six hundred sixty-five million, five hundred four thousand, three hundred twelve".