21131633630 has 8 divisors (see below), whose sum is σ = 38036940552. Its totient is φ = 8452653448.

The previous prime is 21131633557. The next prime is 21131633651. The reversal of 21131633630 is 3633613112.

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

It is a junction number, because it is equal to n+sod(n) for n = 21131633593 and 21131633602.

It is a congruent number.

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, 1056581672 + ... + 1056581691.

It is an arithmetic number, because the mean of its divisors is an integer number (4754617569).

Almost surely, 2^21131633630 is an apocalyptic number.

21131633630 is a deficient number, since it is larger than the sum of its proper divisors (16905306922).

21131633630 is a wasteful number, since it uses less digits than its factorization.

21131633630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2113163370.

The product of its (nonzero) digits is 5832, while the sum is 29.

The spelling of 21131633630 in words is "twenty-one billion, one hundred thirty-one million, six hundred thirty-three thousand, six hundred thirty".