21473415387 has 32 divisors (see below), whose sum is σ = 32472576000. Its totient is φ = 14020377120.

The previous prime is 21473415263. The next prime is 21473415391. The reversal of 21473415387 is 78351437412.

21473415387 is a `hidden beast` number, since 2 + 1 + 4 + 73 + 41 + 538 + 7 = 666.

It is not a de Polignac number, because 21473415387 - 2⁷ = 21473415259 is a prime.

It is a super-2 number, since 2×21473415387² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21473315387) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 403462 + ... + 453572.

It is an arithmetic number, because the mean of its divisors is an integer number (1014768000).

Almost surely, 2^21473415387 is an apocalyptic number.

21473415387 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

21473415387 is a deficient number, since it is larger than the sum of its proper divisors (10999160613).

21473415387 is a wasteful number, since it uses less digits than its factorization.

21473415387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50448 (or 50442 counting only the distinct ones).

The product of its digits is 564480, while the sum is 45.

The spelling of 21473415387 in words is "twenty-one billion, four hundred seventy-three million, four hundred fifteen thousand, three hundred eighty-seven".