21136634574 has 16 divisors (see below), whose sum is σ = 46116293760. Its totient is φ = 6405040760.

The previous prime is 21136634567. The next prime is 21136634581. The reversal of 21136634574 is 47543663112.

It is an interprime number because it is at equal distance from previous prime (21136634567) and next prime (21136634581).

It is a super-2 number, since 2×21136634574² (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 7 ways as a sum of consecutive naturals, for example, 160125954 + ... + 160126085.

It is an arithmetic number, because the mean of its divisors is an integer number (2882268360).

Almost surely, 2^21136634574 is an apocalyptic number.

21136634574 is an abundant number, since it is smaller than the sum of its proper divisors (24979659186).

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

21136634574 is a wasteful number, since it uses less digits than its factorization.

21136634574 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 320252055.

The product of its digits is 362880, while the sum is 42.

The spelling of 21136634574 in words is "twenty-one billion, one hundred thirty-six million, six hundred thirty-four thousand, five hundred seventy-four".