21043232631 has 12 divisors (see below), whose sum is σ = 30399253560. Its totient is φ = 14027218800.

The previous prime is 21043232603. The next prime is 21043232641. The reversal of 21043232631 is 13623234012.

21043232631 is a `hidden beast` number, since 2 + 1 + 0 + 4 + 3 + 23 + 2 + 631 = 666.

It is not a de Polignac number, because 21043232631 - 2¹⁴ = 21043216247 is a prime.

It is a super-2 number, since 2×21043232631² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21043232595 and 21043232604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21043232641) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 47520 + ... + 210581.

It is an arithmetic number, because the mean of its divisors is an integer number (2533271130).

Almost surely, 2^21043232631 is an apocalyptic number.

21043232631 is a deficient number, since it is larger than the sum of its proper divisors (9356020929).

21043232631 is a wasteful number, since it uses less digits than its factorization.

21043232631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 267166 (or 267163 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 27.

Adding to 21043232631 its reverse (13623234012), we get a palindrome (34666466643).

The spelling of 21043232631 in words is "twenty-one billion, forty-three million, two hundred thirty-two thousand, six hundred thirty-one".