22012222221021 has 16 divisors (see below), whose sum is σ = 29451630087936. Its totient is φ = 14623820813376.

The previous prime is 22012222221013. The next prime is 22012222221049. The reversal of 22012222221021 is 12012222221022.

It is not a de Polignac number, because 22012222221021 - 2³ = 22012222221013 is a prime.

It is a super-2 number, since 2×22012222221021² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22012222221071) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13515996 + ... + 15056778.

It is an arithmetic number, because the mean of its divisors is an integer number (1840726880496).

Almost surely, 2^{22012222221021} is an apocalyptic number.

It is an amenable number.

22012222221021 is a deficient number, since it is larger than the sum of its proper divisors (7439407866915).

22012222221021 is a wasteful number, since it uses less digits than its factorization.

22012222221021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1557332.

The product of its (nonzero) digits is 512, while the sum is 21.

Adding to 22012222221021 its reverse (12012222221022), we get a palindrome (34024444442043).

Subtracting from 22012222221021 its reverse (12012222221022), we obtain a palindrome (9999999999999).

The spelling of 22012222221021 in words is "twenty-two trillion, twelve billion, two hundred twenty-two million, two hundred twenty-one thousand, twenty-one".