21232322431 has 4 divisors (see below), whose sum is σ = 22481282592. Its totient is φ = 19983362272.

The previous prime is 21232322429. The next prime is 21232322453. The reversal of 21232322431 is 13422323212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21232322431 - 2¹ = 21232322429 is a prime.

It is a super-2 number, since 2×21232322431² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21232322396 and 21232322405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21232322401) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 624480055 + ... + 624480088.

It is an arithmetic number, because the mean of its divisors is an integer number (5620320648).

Almost surely, 2^21232322431 is an apocalyptic number.

21232322431 is a deficient number, since it is larger than the sum of its proper divisors (1248960161).

21232322431 is a wasteful number, since it uses less digits than its factorization.

21232322431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1248960160.

The product of its digits is 3456, while the sum is 25.

Adding to 21232322431 its reverse (13422323212), we get a palindrome (34654645643).

The spelling of 21232322431 in words is "twenty-one billion, two hundred thirty-two million, three hundred twenty-two thousand, four hundred thirty-one".