21132022431 has 32 divisors (see below), whose sum is σ = 32147333568. Its totient is φ = 12232120320.

The previous prime is 21132022427. The next prime is 21132022447. The reversal of 21132022431 is 13422023112.

It is not a de Polignac number, because 21132022431 - 2² = 21132022427 is a prime.

It is a super-2 number, since 2×21132022431² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21132022398 and 21132022407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21132022481) 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, 1235961 + ... + 1252941.

It is an arithmetic number, because the mean of its divisors is an integer number (1004604174).

Almost surely, 2^21132022431 is an apocalyptic number.

21132022431 is a deficient number, since it is larger than the sum of its proper divisors (11015311137).

21132022431 is a wasteful number, since it uses less digits than its factorization.

21132022431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18891.

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 21132022431 its reverse (13422023112), we get a palindrome (34554045543).

The spelling of 21132022431 in words is "twenty-one billion, one hundred thirty-two million, twenty-two thousand, four hundred thirty-one".