22221102200021 has 8 divisors (see below), whose sum is σ = 23000110815000. Its totient is φ = 21442944499200.

The previous prime is 22221102200009. The next prime is 22221102200051. The reversal of 22221102200021 is 12000220112222.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 3638441800900 + 18582660399121 = 1907470^2 + 4310761^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 22221102200021 - 2¹⁸ = 22221101937877 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22221102200051) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 212675396 + ... + 212779853.

It is an arithmetic number, because the mean of its divisors is an integer number (2875013851875).

Almost surely, 2^{22221102200021} is an apocalyptic number.

It is an amenable number.

22221102200021 is a deficient number, since it is larger than the sum of its proper divisors (779008614979).

22221102200021 is a wasteful number, since it uses less digits than its factorization.

22221102200021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 425457079.

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

Adding to 22221102200021 its reverse (12000220112222), we get a palindrome (34221322312243).

The spelling of 22221102200021 in words is "twenty-two trillion, two hundred twenty-one billion, one hundred two million, two hundred thousand, twenty-one".