21365880412 has 12 divisors (see below), whose sum is σ = 37391313960. Its totient is φ = 10682647856.

The previous prime is 21365880391. The next prime is 21365880421. The reversal of 21365880412 is 21408856312.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 253014 + ... + 326722.

It is an arithmetic number, because the mean of its divisors is an integer number (3115942830).

Almost surely, 2^21365880412 is an apocalyptic number.

It is an amenable number.

21365880412 is a deficient number, since it is larger than the sum of its proper divisors (16025433548).

21365880412 is a wasteful number, since it uses less digits than its factorization.

21365880412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146180 (or 146178 counting only the distinct ones).

The product of its (nonzero) digits is 92160, while the sum is 40.

The spelling of 21365880412 in words is "twenty-one billion, three hundred sixty-five million, eight hundred eighty thousand, four hundred twelve".