21586670451 has 16 divisors (see below), whose sum is σ = 32339584800. Its totient is φ = 14229414144.

The previous prime is 21586670429. The next prime is 21586670453. The reversal of 21586670451 is 15407668512.

21586670451 is a `hidden beast` number, since 2 + 1 + 586 + 67 + 0 + 4 + 5 + 1 = 666.

It is not a de Polignac number, because 21586670451 - 2⁵ = 21586670419 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21586670397 and 21586670406.

It is not an unprimeable number, because it can be changed into a prime (21586670453) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4489206 + ... + 4494011.

It is an arithmetic number, because the mean of its divisors is an integer number (2021224050).

Almost surely, 2^21586670451 is an apocalyptic number.

21586670451 is a deficient number, since it is larger than the sum of its proper divisors (10752914349).

21586670451 is an equidigital number, since it uses as much as digits as its factorization.

21586670451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8983315 (or 8983309 counting only the distinct ones).

The product of its (nonzero) digits is 403200, while the sum is 45.

The spelling of 21586670451 in words is "twenty-one billion, five hundred eighty-six million, six hundred seventy thousand, four hundred fifty-one".