21332224431 has 18 divisors (see below), whose sum is σ = 35843942472. Its totient is φ = 12189842280.

The previous prime is 21332224423. The next prime is 21332224447. The reversal of 21332224431 is 13442223312.

21332224431 is a `hidden beast` number, since 2 + 1 + 3 + 3 + 2 + 224 + 431 = 666.

It is not a de Polignac number, because 21332224431 - 2³ = 21332224423 is a prime.

It is a super-2 number, since 2×21332224431² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21332224395 and 21332224404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21332224451) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 24185755 + ... + 24186636.

Almost surely, 2^21332224431 is an apocalyptic number.

21332224431 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21332224431 is a deficient number, since it is larger than the sum of its proper divisors (14511718041).

21332224431 is a wasteful number, since it uses less digits than its factorization.

21332224431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48372411 (or 48372401 counting only the distinct ones).

The product of its digits is 6912, while the sum is 27.

Adding to 21332224431 its reverse (13442223312), we get a palindrome (34774447743).

The spelling of 21332224431 in words is "twenty-one billion, three hundred thirty-two million, two hundred twenty-four thousand, four hundred thirty-one".