21013230231 has 12 divisors (see below), whose sum is σ = 34688507152. Its totient is φ = 12007560096.

The previous prime is 21013230221. The next prime is 21013230257. The reversal of 21013230231 is 13203231012.

It is not a de Polignac number, because 21013230231 - 2²¹ = 21011133079 is a prime.

It is a super-2 number, since 2×21013230231² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21013230211) 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 11 ways as a sum of consecutive naturals, for example, 166771606 + ... + 166771731.

Almost surely, 2^21013230231 is an apocalyptic number.

21013230231 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21013230231 is a deficient number, since it is larger than the sum of its proper divisors (13675276921).

21013230231 is a wasteful number, since it uses less digits than its factorization.

21013230231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 333543350 (or 333543347 counting only the distinct ones).

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

Adding to 21013230231 its reverse (13203231012), we get a palindrome (34216461243).

The spelling of 21013230231 in words is "twenty-one billion, thirteen million, two hundred thirty thousand, two hundred thirty-one".