21312300231 has 16 divisors (see below), whose sum is σ = 32091383520. Its totient is φ = 13975277760.

The previous prime is 21312300203. The next prime is 21312300271. The reversal of 21312300231 is 13200321312.

21312300231 is a `hidden beast` number, since 2 + 131 + 2 + 300 + 231 = 666.

It is not a de Polignac number, because 21312300231 - 2⁶ = 21312300167 is a prime.

It is a super-2 number, since 2×21312300231² (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 (21312300271) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6468390 + ... + 6471683.

It is an arithmetic number, because the mean of its divisors is an integer number (2005711470).

Almost surely, 2^21312300231 is an apocalyptic number.

21312300231 is a deficient number, since it is larger than the sum of its proper divisors (10779083289).

21312300231 is a wasteful number, since it uses less digits than its factorization.

21312300231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12940143 (or 12940137 counting only the distinct ones).

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

Adding to 21312300231 its reverse (13200321312), we get a palindrome (34512621543).

The spelling of 21312300231 in words is "twenty-one billion, three hundred twelve million, three hundred thousand, two hundred thirty-one".