23040120021 has 4 divisors (see below), whose sum is σ = 30720160032. Its totient is φ = 15360080012.

The previous prime is 23040120007. The next prime is 23040120029. The reversal of 23040120021 is 12002104032.

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 23040120021 - 2¹⁵ = 23040087253 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23040120029) 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, 3840020001 + ... + 3840020006.

It is an arithmetic number, because the mean of its divisors is an integer number (7680040008).

Almost surely, 2^23040120021 is an apocalyptic number.

It is an amenable number.

23040120021 is a deficient number, since it is larger than the sum of its proper divisors (7680040011).

23040120021 is an equidigital number, since it uses as much as digits as its factorization.

23040120021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7680040010.

The product of its (nonzero) digits is 96, while the sum is 15.

Adding to 23040120021 its reverse (12002104032), we get a palindrome (35042224053).

The spelling of 23040120021 in words is "twenty-three billion, forty million, one hundred twenty thousand, twenty-one".