21697710031 has 8 divisors (see below), whose sum is σ = 22766181984. Its totient is φ = 20639662560.

The previous prime is 21697710017. The next prime is 21697710049. The reversal of 21697710031 is 13001779612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21697710031 - 2⁷ = 21697709903 is a prime.

It is a super-2 number, since 2×21697710031² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21697710091) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2601856 + ... + 2610181.

It is an arithmetic number, because the mean of its divisors is an integer number (2845772748).

Almost surely, 2^21697710031 is an apocalyptic number.

21697710031 is a deficient number, since it is larger than the sum of its proper divisors (1068471953).

21697710031 is a wasteful number, since it uses less digits than its factorization.

21697710031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5212241.

The product of its (nonzero) digits is 15876, while the sum is 37.

The spelling of 21697710031 in words is "twenty-one billion, six hundred ninety-seven million, seven hundred ten thousand, thirty-one".