23015020321 has 4 divisors (see below), whose sum is σ = 24226337200. Its totient is φ = 21803703444.

The previous prime is 23015020243. The next prime is 23015020337. The reversal of 23015020321 is 12302051032.

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 23015020321 - 2¹⁵ = 23014987553 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19), and also a Moran number because the ratio is a prime number: 1211316859 = 23015020321 / (2 + 3 + 0 + 1 + 5 + 0 + 2 + 0 + 3 + 2 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23015020361) 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 3 ways as a sum of consecutive naturals, for example, 605658411 + ... + 605658448.

It is an arithmetic number, because the mean of its divisors is an integer number (6056584300).

Almost surely, 2^23015020321 is an apocalyptic number.

It is an amenable number.

23015020321 is a deficient number, since it is larger than the sum of its proper divisors (1211316879).

23015020321 is a wasteful number, since it uses less digits than its factorization.

23015020321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1211316878.

The product of its (nonzero) digits is 360, while the sum is 19.

Adding to 23015020321 its reverse (12302051032), we get a palindrome (35317071353).

The spelling of 23015020321 in words is "twenty-three billion, fifteen million, twenty thousand, three hundred twenty-one".