21630131902 has 8 divisors (see below), whose sum is σ = 32855896800. Its totient is φ = 10678166304.

The previous prime is 21630131857. The next prime is 21630131903. The reversal of 21630131902 is 20913103612.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21630131903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 68449627 + ... + 68449942.

It is an arithmetic number, because the mean of its divisors is an integer number (4106987100).

Almost surely, 2^21630131902 is an apocalyptic number.

21630131902 is a deficient number, since it is larger than the sum of its proper divisors (11225764898).

21630131902 is a wasteful number, since it uses less digits than its factorization.

21630131902 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136899650.

The product of its (nonzero) digits is 1944, while the sum is 28.

The spelling of 21630131902 in words is "twenty-one billion, six hundred thirty million, one hundred thirty-one thousand, nine hundred two".