23023121221 has 4 divisors (see below), whose sum is σ = 23512974912. Its totient is φ = 22533267532.

The previous prime is 23023121183. The next prime is 23023121243. The reversal of 23023121221 is 12212132032.

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 23023121221 - 2¹¹ = 23023119173 is a prime.

It is a super-2 number, since 2×23023121221² (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 (23023101221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 244926775 + ... + 244926868.

It is an arithmetic number, because the mean of its divisors is an integer number (5878243728).

Almost surely, 2^23023121221 is an apocalyptic number.

It is an amenable number.

23023121221 is a deficient number, since it is larger than the sum of its proper divisors (489853691).

23023121221 is an equidigital number, since it uses as much as digits as its factorization.

23023121221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 489853690.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 23023121221 its reverse (12212132032), we get a palindrome (35235253253).

The spelling of 23023121221 in words is "twenty-three billion, twenty-three million, one hundred twenty-one thousand, two hundred twenty-one".