23021022221 has 4 divisors (see below), whose sum is σ = 23038691232. Its totient is φ = 23003353212.

The previous prime is 23021022197. The next prime is 23021022239. The reversal of 23021022221 is 12222012032.

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 23021022221 - 2²² = 23016827917 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 23021022221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23021052221) 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, 8832551 + ... + 8835156.

It is an arithmetic number, because the mean of its divisors is an integer number (5759672808).

Almost surely, 2^23021022221 is an apocalyptic number.

It is an amenable number.

23021022221 is a deficient number, since it is larger than the sum of its proper divisors (17669011).

23021022221 is a wasteful number, since it uses less digits than its factorization.

23021022221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17669010.

The product of its (nonzero) digits is 192, while the sum is 17.

Adding to 23021022221 its reverse (12222012032), we get a palindrome (35243034253).

The spelling of 23021022221 in words is "twenty-three billion, twenty-one million, twenty-two thousand, two hundred twenty-one".