21712570839 has 12 divisors (see below), whose sum is σ = 31365234576. Its totient is φ = 14473832352.

The previous prime is 21712570823. The next prime is 21712570879. The reversal of 21712570839 is 93807521712.

21712570839 is a `hidden beast` number, since 2 + 1 + 71 + 2 + 570 + 8 + 3 + 9 = 666.

It is not a de Polignac number, because 21712570839 - 2⁴ = 21712570823 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21712570794 and 21712570803.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21712570879) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19534 + ... + 209300.

It is an arithmetic number, because the mean of its divisors is an integer number (2613769548).

Almost surely, 2^21712570839 is an apocalyptic number.

21712570839 is a deficient number, since it is larger than the sum of its proper divisors (9652663737).

21712570839 is a wasteful number, since it uses less digits than its factorization.

21712570839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 202486 (or 202483 counting only the distinct ones).

The product of its (nonzero) digits is 211680, while the sum is 45.

The spelling of 21712570839 in words is "twenty-one billion, seven hundred twelve million, five hundred seventy thousand, eight hundred thirty-nine".