23397828421 has 4 divisors (see below), whose sum is σ = 25524903744. Its totient is φ = 21270753100.

The previous prime is 23397828403. The next prime is 23397828427. The reversal of 23397828421 is 12482879332.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 23397828421 - 2³³ = 14807893829 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 (23397828427) 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, 1063537645 + ... + 1063537666.

It is an arithmetic number, because the mean of its divisors is an integer number (6381225936).

Almost surely, 2^23397828421 is an apocalyptic number.

It is an amenable number.

23397828421 is a deficient number, since it is larger than the sum of its proper divisors (2127075323).

23397828421 is a wasteful number, since it uses less digits than its factorization.

23397828421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2127075322.

The product of its digits is 1161216, while the sum is 49.

The spelling of 23397828421 in words is "twenty-three billion, three hundred ninety-seven million, eight hundred twenty-eight thousand, four hundred twenty-one".