21637531636232 has 16 divisors (see below), whose sum is σ = 40988623075260. Its totient is φ = 10707232149504.

The previous prime is 21637531636229. The next prime is 21637531636271. The reversal of 21637531636232 is 23263613573612.

It can be written as a sum of positive squares in 2 ways, for example, as 20824674320836 + 812857315396 = 4563406^2 + 901586^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13941707753 + ... + 13941709304.

Almost surely, 2^{21637531636232} is an apocalyptic number.

It is an amenable number.

21637531636232 is a deficient number, since it is larger than the sum of its proper divisors (19351091439028).

21637531636232 is a wasteful number, since it uses less digits than its factorization.

21637531636232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27883417160 (or 27883417156 counting only the distinct ones).

The product of its digits is 4898880, while the sum is 50.

The spelling of 21637531636232 in words is "twenty-one trillion, six hundred thirty-seven billion, five hundred thirty-one million, six hundred thirty-six thousand, two hundred thirty-two".