21031159896 has 64 divisors (see below), whose sum is σ = 58482799200. Its totient is φ = 7002837504.

The previous prime is 21031159859. The next prime is 21031159931. The reversal of 21031159896 is 69895113012.

21031159896 is a `hidden beast` number, since 21 + 0 + 31 + 1 + 598 + 9 + 6 = 666.

It is a super-2 number, since 2×21031159896² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

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, 150436 + ... + 254348.

Almost surely, 2^21031159896 is an apocalyptic number.

It is an amenable number.

21031159896 is an abundant number, since it is smaller than the sum of its proper divisors (37451639304).

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

21031159896 is a wasteful number, since it uses less digits than its factorization.

21031159896 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104865 (or 104855 counting only the distinct ones).

The product of its (nonzero) digits is 116640, while the sum is 45.

The spelling of 21031159896 in words is "twenty-one billion, thirty-one million, one hundred fifty-nine thousand, eight hundred ninety-six".