23120320021 has 4 divisors (see below), whose sum is σ = 23249484000. Its totient is φ = 22991156044.

The previous prime is 23120319997. The next prime is 23120320033. The reversal of 23120320021 is 12002302132.

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 23120320021 - 2¹³ = 23120311829 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 23120319977 and 23120320004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23120320051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64581721 + ... + 64582078.

It is an arithmetic number, because the mean of its divisors is an integer number (5812371000).

Almost surely, 2^23120320021 is an apocalyptic number.

It is an amenable number.

23120320021 is a deficient number, since it is larger than the sum of its proper divisors (129163979).

23120320021 is a wasteful number, since it uses less digits than its factorization.

23120320021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129163978.

The product of its (nonzero) digits is 144, while the sum is 16.

Adding to 23120320021 its reverse (12002302132), we get a palindrome (35122622153).

The spelling of 23120320021 in words is "twenty-three billion, one hundred twenty million, three hundred twenty thousand, twenty-one".