21630153231 has 6 divisors (see below), whose sum is σ = 31243554680. Its totient is φ = 14420102148.

The previous prime is 21630153227. The next prime is 21630153241. The reversal of 21630153231 is 13235103612.

21630153231 is a `hidden beast` number, since 2 + 1 + 630 + 1 + 5 + 3 + 23 + 1 = 666.

It is not a de Polignac number, because 21630153231 - 2² = 21630153227 is a prime.

It is a super-2 number, since 2×21630153231² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21630153195 and 21630153204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21630153241) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1201675171 + ... + 1201675188.

Almost surely, 2^21630153231 is an apocalyptic number.

21630153231 is a deficient number, since it is larger than the sum of its proper divisors (9613401449).

21630153231 is a wasteful number, since it uses less digits than its factorization.

21630153231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2403350365 (or 2403350362 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 27.

Adding to 21630153231 its reverse (13235103612), we get a palindrome (34865256843).

The spelling of 21630153231 in words is "twenty-one billion, six hundred thirty million, one hundred fifty-three thousand, two hundred thirty-one".