21425669712 has 60 divisors (see below), whose sum is σ = 60219559764. Its totient is φ = 7111226880.

The previous prime is 21425669701. The next prime is 21425669729. The reversal of 21425669712 is 21796652412.

21425669712 is a `hidden beast` number, since 2 + 14 + 2 + 566 + 9 + 71 + 2 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 8912115216 + 12513554496 = 94404^2 + 111864^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 285739 + ... + 352842.

Almost surely, 2^21425669712 is an apocalyptic number.

It is an amenable number.

21425669712 is an abundant number, since it is smaller than the sum of its proper divisors (38793890052).

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

21425669712 is a wasteful number, since it uses less digits than its factorization.

21425669712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 638828 (or 638819 counting only the distinct ones).

The product of its digits is 362880, while the sum is 45.

The spelling of 21425669712 in words is "twenty-one billion, four hundred twenty-five million, six hundred sixty-nine thousand, seven hundred twelve".