21471290692 has 12 divisors (see below), whose sum is σ = 38190738796. Its totient is φ = 10559651040.

The previous prime is 21471290669. The next prime is 21471290707. The reversal of 21471290692 is 29609217412.

It can be written as a sum of positive squares in 2 ways, for example, as 9059993856 + 12411296836 = 95184^2 + 111406^2 .

It is a super-2 number, since 2×21471290692² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43998303 + ... + 43998790.

Almost surely, 2^21471290692 is an apocalyptic number.

It is an amenable number.

21471290692 is a deficient number, since it is larger than the sum of its proper divisors (16719448104).

21471290692 is a wasteful number, since it uses less digits than its factorization.

21471290692 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87997158 (or 87997156 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 43.

The spelling of 21471290692 in words is "twenty-one billion, four hundred seventy-one million, two hundred ninety thousand, six hundred ninety-two".