23315321421 has 64 divisors (see below), whose sum is σ = 41688944640. Its totient is φ = 12590043840.

The previous prime is 23315321417. The next prime is 23315321437. The reversal of 23315321421 is 12412351332.

23315321421 is a `hidden beast` number, since 2 + 3 + 315 + 321 + 4 + 21 = 666.

It is not a de Polignac number, because 23315321421 - 2² = 23315321417 is a prime.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23315321441) 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 63 ways as a sum of consecutive naturals, for example, 328491 + ... + 393111.

It is an arithmetic number, because the mean of its divisors is an integer number (651389760).

Almost surely, 2^23315321421 is an apocalyptic number.

23315321421 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

23315321421 is a deficient number, since it is larger than the sum of its proper divisors (18373623219).

23315321421 is a wasteful number, since it uses less digits than its factorization.

23315321421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64743 (or 64737 counting only the distinct ones).

The product of its digits is 4320, while the sum is 27.

Adding to 23315321421 its reverse (12412351332), we get a palindrome (35727672753).

The spelling of 23315321421 in words is "twenty-three billion, three hundred fifteen million, three hundred twenty-one thousand, four hundred twenty-one".