23432431221 has 16 divisors (see below), whose sum is σ = 34766321920. Its totient is φ = 15598396800.

The previous prime is 23432431213. The next prime is 23432431277. The reversal of 23432431221 is 12213423432.

23432431221 is a `hidden beast` number, since 2 + 3 + 4 + 3 + 2 + 431 + 221 = 666.

It is not a de Polignac number, because 23432431221 - 2³ = 23432431213 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23432411221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 626605 + ... + 662946.

It is an arithmetic number, because the mean of its divisors is an integer number (2172895120).

Almost surely, 2^23432431221 is an apocalyptic number.

It is an amenable number.

23432431221 is a deficient number, since it is larger than the sum of its proper divisors (11333890699).

23432431221 is a wasteful number, since it uses less digits than its factorization.

23432431221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1290233 (or 1290227 counting only the distinct ones).

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

Adding to 23432431221 its reverse (12213423432), we get a palindrome (35645854653).

The spelling of 23432431221 in words is "twenty-three billion, four hundred thirty-two million, four hundred thirty-one thousand, two hundred twenty-one".