23531534621 has 4 divisors (see below), whose sum is σ = 26893182432. Its totient is φ = 20169886812.

The previous prime is 23531534581. The next prime is 23531534627. The reversal of 23531534621 is 12643513532.

It is a happy number.

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 23531534621 - 2¹⁴ = 23531518237 is a prime.

It is a super-2 number, since 2×23531534621² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23531534627) 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, 1680823895 + ... + 1680823908.

It is an arithmetic number, because the mean of its divisors is an integer number (6723295608).

Almost surely, 2^23531534621 is an apocalyptic number.

It is an amenable number.

23531534621 is a deficient number, since it is larger than the sum of its proper divisors (3361647811).

23531534621 is an equidigital number, since it uses as much as digits as its factorization.

23531534621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3361647810.

The product of its digits is 64800, while the sum is 35.

The spelling of 23531534621 in words is "twenty-three billion, five hundred thirty-one million, five hundred thirty-four thousand, six hundred twenty-one".