21712152465 has 40 divisors (see below), whose sum is σ = 40176584448. Its totient is φ = 11206265760.

The previous prime is 21712152461. The next prime is 21712152487. The reversal of 21712152465 is 56425121712.

21712152465 is a `hidden beast` number, since 2 + 1 + 7 + 121 + 524 + 6 + 5 = 666.

It is not a de Polignac number, because 21712152465 - 2² = 21712152461 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21712152461) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 852127 + ... + 877236.

Almost surely, 2^21712152465 is an apocalyptic number.

It is an amenable number.

21712152465 is a deficient number, since it is larger than the sum of its proper divisors (18464431983).

21712152465 is a wasteful number, since it uses less digits than its factorization.

21712152465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1729411 (or 1729402 counting only the distinct ones).

The product of its digits is 33600, while the sum is 36.

The spelling of 21712152465 in words is "twenty-one billion, seven hundred twelve million, one hundred fifty-two thousand, four hundred sixty-five".