21470471955 has 40 divisors (see below), whose sum is σ = 38951578512. Its totient is φ = 11312937792.

The previous prime is 21470471947. The next prime is 21470471969. The reversal of 21470471955 is 55917407412.

21470471955 is a `hidden beast` number, since 21 + 4 + 70 + 471 + 95 + 5 = 666.

It is not a de Polignac number, because 21470471955 - 2³ = 21470471947 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 21470471955.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 285744 + ... + 352973.

Almost surely, 2^21470471955 is an apocalyptic number.

21470471955 is a deficient number, since it is larger than the sum of its proper divisors (17481106557).

21470471955 is an equidigital number, since it uses as much as digits as its factorization.

21470471955 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 638817 (or 638808 counting only the distinct ones).

The product of its (nonzero) digits is 352800, while the sum is 45.

The spelling of 21470471955 in words is "twenty-one billion, four hundred seventy million, four hundred seventy-one thousand, nine hundred fifty-five".