23215055221 has 4 divisors (see below), whose sum is σ = 24224405472. Its totient is φ = 22205704972.

The previous prime is 23215055197. The next prime is 23215055251. The reversal of 23215055221 is 12255051232.

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 a de Polignac number, because none of the positive numbers 2^k-23215055221 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 23215055221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23215055251) 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, 504675091 + ... + 504675136.

It is an arithmetic number, because the mean of its divisors is an integer number (6056101368).

Almost surely, 2^23215055221 is an apocalyptic number.

It is an amenable number.

23215055221 is a deficient number, since it is larger than the sum of its proper divisors (1009350251).

23215055221 is a wasteful number, since it uses less digits than its factorization.

23215055221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1009350250.

The product of its (nonzero) digits is 6000, while the sum is 28.

The spelling of 23215055221 in words is "twenty-three billion, two hundred fifteen million, fifty-five thousand, two hundred twenty-one".