21279825512712 has 64 divisors (see below), whose sum is σ = 63657597696000. Its totient is φ = 6547638618432.

The previous prime is 21279825512707. The next prime is 21279825512753. The reversal of 21279825512712 is 21721552897212.

21279825512712 is a `hidden beast` number, since 2 + 1 + 2 + 7 + 9 + 82 + 551 + 2 + 7 + 1 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

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, 3789139912 + ... + 3789145527.

It is an arithmetic number, because the mean of its divisors is an integer number (994649964000).

Almost surely, 2^{21279825512712} is an apocalyptic number.

It is an amenable number.

21279825512712 is an abundant number, since it is smaller than the sum of its proper divisors (42377772183288).

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

21279825512712 is a wasteful number, since it uses less digits than its factorization.

21279825512712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7578285467 (or 7578285457 counting only the distinct ones).

The product of its digits is 2822400, while the sum is 54.

The spelling of 21279825512712 in words is "twenty-one trillion, two hundred seventy-nine billion, eight hundred twenty-five million, five hundred twelve thousand, seven hundred twelve".