21631542164234 has 8 divisors (see below), whose sum is σ = 32781821630628. Its totient is φ = 10704268287360.

The previous prime is 21631542164213. The next prime is 21631542164251. The reversal of 21631542164234 is 43246124513612.

It can be written as a sum of positive squares in 2 ways, for example, as 21631363808209 + 178356025 = 4650953^2 + 13355^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55751397137 + ... + 55751397524.

Almost surely, 2^{21631542164234} is an apocalyptic number.

21631542164234 is a deficient number, since it is larger than the sum of its proper divisors (11150279466394).

21631542164234 is a wasteful number, since it uses less digits than its factorization.

21631542164234 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111502794760.

The product of its digits is 829440, while the sum is 44.

Adding to 21631542164234 its reverse (43246124513612), we get a palindrome (64877666677846).

The spelling of 21631542164234 in words is "twenty-one trillion, six hundred thirty-one billion, five hundred forty-two million, one hundred sixty-four thousand, two hundred thirty-four".