21631432075313 has 8 divisors (see below), whose sum is σ = 22135981735296. Its totient is φ = 21126950283600.

The previous prime is 21631432075307. The next prime is 21631432075333. The reversal of 21631432075313 is 31357023413612.

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

It is a de Polignac number, because none of the positive numbers 2^k-21631432075313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21631432075333) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16321898 + ... + 17597363.

It is an arithmetic number, because the mean of its divisors is an integer number (2766997716912).

Almost surely, 2^{21631432075313} is an apocalyptic number.

It is an amenable number.

21631432075313 is a deficient number, since it is larger than the sum of its proper divisors (504549659983).

21631432075313 is a wasteful number, since it uses less digits than its factorization.

21631432075313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33934135.

The product of its (nonzero) digits is 272160, while the sum is 41.

Adding to 21631432075313 its reverse (31357023413612), we get a palindrome (52988455488925).

The spelling of 21631432075313 in words is "twenty-one trillion, six hundred thirty-one billion, four hundred thirty-two million, seventy-five thousand, three hundred thirteen".