22222120100021 has 4 divisors (see below), whose sum is σ = 22988400103500. Its totient is φ = 21455840096544.

The previous prime is 22222120100003. The next prime is 22222120100023. The reversal of 22222120100021 is 12000102122222.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6454978642225 + 15767141457796 = 2540665^2 + 3970786^2 .

It is a cyclic number.

It is not a de Polignac number, because 22222120100021 - 2²⁶ = 22222052991157 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 (22222120100023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 383140001696 + ... + 383140001753.

It is an arithmetic number, because the mean of its divisors is an integer number (5747100025875).

Almost surely, 2^{22222120100021} is an apocalyptic number.

It is an amenable number.

22222120100021 is a deficient number, since it is larger than the sum of its proper divisors (766280003479).

22222120100021 is an equidigital number, since it uses as much as digits as its factorization.

22222120100021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 766280003478.

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

Adding to 22222120100021 its reverse (12000102122222), we get a palindrome (34222222222243).

The spelling of 22222120100021 in words is "twenty-two trillion, two hundred twenty-two billion, one hundred twenty million, one hundred thousand, twenty-one".