21230012331 has 32 divisors (see below), whose sum is σ = 35109085440. Its totient is φ = 12567441600.

The previous prime is 21230012269. The next prime is 21230012333. The reversal of 21230012331 is 13321003212.

21230012331 is a `hidden beast` number, since 21 + 2 + 300 + 12 + 331 = 666.

It is not a de Polignac number, because 21230012331 - 2⁹ = 21230011819 is a prime.

It is a super-2 number, since 2×21230012331² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21230012333) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 818410 + ... + 843951.

It is an arithmetic number, because the mean of its divisors is an integer number (1097158920).

Almost surely, 2^21230012331 is an apocalyptic number.

21230012331 is a deficient number, since it is larger than the sum of its proper divisors (13879073109).

21230012331 is a wasteful number, since it uses less digits than its factorization.

21230012331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1662424 (or 1662418 counting only the distinct ones).

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

Adding to 21230012331 its reverse (13321003212), we get a palindrome (34551015543).

The spelling of 21230012331 in words is "twenty-one billion, two hundred thirty million, twelve thousand, three hundred thirty-one".