23211432421 has 4 divisors (see below), whose sum is σ = 23254337644. Its totient is φ = 23168527200.

The previous prime is 23211432397. The next prime is 23211432427. The reversal of 23211432421 is 12423411232.

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

It can be written as a sum of positive squares in 2 ways, for example, as 3747276225 + 19464156196 = 61215^2 + 139514^2 .

It is a cyclic number.

It is not a de Polignac number, because 23211432421 - 2²³ = 23203043813 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23211432427) 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, 21451800 + ... + 21452881.

It is an arithmetic number, because the mean of its divisors is an integer number (5813584411).

Almost surely, 2^23211432421 is an apocalyptic number.

It is an amenable number.

23211432421 is a deficient number, since it is larger than the sum of its proper divisors (42905223).

23211432421 is an equidigital number, since it uses as much as digits as its factorization.

23211432421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42905222.

The product of its digits is 2304, while the sum is 25.

Adding to 23211432421 its reverse (12423411232), we get a palindrome (35634843653).

The spelling of 23211432421 in words is "twenty-three billion, two hundred eleven million, four hundred thirty-two thousand, four hundred twenty-one".