21013032231 has 20 divisors (see below), whose sum is σ = 32754616752. Its totient is φ = 13399613568.

The previous prime is 21013032137. The next prime is 21013032233. The reversal of 21013032231 is 13223031012.

21013032231 is a `hidden beast` number, since 210 + 130 + 322 + 3 + 1 = 666.

It is not a de Polignac number, because 21013032231 - 2¹⁴ = 21013015847 is a prime.

It is a super-2 number, since 2×21013032231² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21013032233) by changing a digit.

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 19 ways as a sum of consecutive naturals, for example, 5637706 + ... + 5641431.

Almost surely, 2^21013032231 is an apocalyptic number.

21013032231 is a deficient number, since it is larger than the sum of its proper divisors (11741584521).

21013032231 is a wasteful number, since it uses less digits than its factorization.

21013032231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11279172 (or 11279163 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 21013032231 its reverse (13223031012), we get a palindrome (34236063243).

The spelling of 21013032231 in words is "twenty-one billion, thirteen million, thirty-two thousand, two hundred thirty-one".