21330012231 has 16 divisors (see below), whose sum is σ = 34472747520. Its totient is φ = 12927279960.

The previous prime is 21330012211. The next prime is 21330012239. The reversal of 21330012231 is 13221003312.

21330012231 is a `hidden beast` number, since 213 + 300 + 122 + 31 = 666.

It is not a de Polignac number, because 21330012231 - 2⁶ = 21330012167 is a prime.

It is a super-2 number, since 2×21330012231² (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 (21330012239) 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 15 ways as a sum of consecutive naturals, for example, 35908815 + ... + 35909408.

It is an arithmetic number, because the mean of its divisors is an integer number (2154546720).

Almost surely, 2^21330012231 is an apocalyptic number.

21330012231 is a deficient number, since it is larger than the sum of its proper divisors (13142735289).

21330012231 is a wasteful number, since it uses less digits than its factorization.

21330012231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71818243 (or 71818237 counting only the distinct ones).

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

Adding to 21330012231 its reverse (13221003312), we get a palindrome (34551015543).

The spelling of 21330012231 in words is "twenty-one billion, three hundred thirty million, twelve thousand, two hundred thirty-one".