21332332431 has 12 divisors (see below), whose sum is σ = 31564915200. Its totient is φ = 13874687520.

The previous prime is 21332332429. The next prime is 21332332447. The reversal of 21332332431 is 13423323312.

21332332431 is a `hidden beast` number, since 2 + 1 + 332 + 3 + 324 + 3 + 1 = 666.

It is not a de Polignac number, because 21332332431 - 2¹ = 21332332429 is a prime.

It is a super-2 number, since 2×21332332431² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21332332395 and 21332332404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21332332471) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 28905231 + ... + 28905968.

It is an arithmetic number, because the mean of its divisors is an integer number (2630409600).

Almost surely, 2^21332332431 is an apocalyptic number.

21332332431 is a deficient number, since it is larger than the sum of its proper divisors (10232582769).

21332332431 is a wasteful number, since it uses less digits than its factorization.

21332332431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57811246 (or 57811243 counting only the distinct ones).

The product of its digits is 7776, while the sum is 27.

Adding to 21332332431 its reverse (13423323312), we get a palindrome (34755655743).

The spelling of 21332332431 in words is "twenty-one billion, three hundred thirty-two million, three hundred thirty-two thousand, four hundred thirty-one".