21731064508 has 12 divisors (see below), whose sum is σ = 39340720440. Its totient is φ = 10490858672.

The previous prime is 21731064461. The next prime is 21731064517. The reversal of 21731064508 is 80546013712.

It is a congruent number.

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, 93668266 + ... + 93668497.

It is an arithmetic number, because the mean of its divisors is an integer number (3278393370).

Almost surely, 2^21731064508 is an apocalyptic number.

It is an amenable number.

21731064508 is a deficient number, since it is larger than the sum of its proper divisors (17609655932).

21731064508 is a wasteful number, since it uses less digits than its factorization.

21731064508 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 187336796 (or 187336794 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 37.

The spelling of 21731064508 in words is "twenty-one billion, seven hundred thirty-one million, sixty-four thousand, five hundred eight".