21631060064 has 12 divisors (see below), whose sum is σ = 42586149564. Its totient is φ = 10815530016.

The previous prime is 21631060063. The next prime is 21631060109. The reversal of 21631060064 is 46006013612.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21631060063) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 337985282 + ... + 337985345.

It is an arithmetic number, because the mean of its divisors is an integer number (3548845797).

Almost surely, 2^21631060064 is an apocalyptic number.

It is an amenable number.

21631060064 is a deficient number, since it is larger than the sum of its proper divisors (20955089500).

21631060064 is an equidigital number, since it uses as much as digits as its factorization.

21631060064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 675970637 (or 675970629 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 29.

Adding to 21631060064 its reverse (46006013612), we get a palindrome (67637073676).

The spelling of 21631060064 in words is "twenty-one billion, six hundred thirty-one million, sixty thousand, sixty-four".