22122000021221 has 4 divisors (see below), whose sum is σ = 22123252771200. Its totient is φ = 22120747271244.

The previous prime is 22122000021169. The next prime is 22122000021223. The reversal of 22122000021221 is 12212000022122.

It is a happy number.

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 22122000021221 - 2²⁶ = 22121932912357 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 22122000021221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22122000021223) 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, 626348501 + ... + 626383818.

It is an arithmetic number, because the mean of its divisors is an integer number (5530813192800).

Almost surely, 2^{22122000021221} is an apocalyptic number.

It is an amenable number.

22122000021221 is a deficient number, since it is larger than the sum of its proper divisors (1252749979).

22122000021221 is a wasteful number, since it uses less digits than its factorization.

22122000021221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1252749978.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 22122000021221 its reverse (12212000022122), we get a palindrome (34334000043343).

Subtracting from 22122000021221 its reverse (12212000022122), we obtain a palindrome (9909999999099).

The spelling of 22122000021221 in words is "twenty-two trillion, one hundred twenty-two billion, twenty-one thousand, two hundred twenty-one".