22122220012021 has 2 divisors, whose sum is σ = 22122220012022. Its totient is φ = 22122220012020.

The previous prime is 22122220012003. The next prime is 22122220012043. The reversal of 22122220012021 is 12021002222122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15426473799025 + 6695746212996 = 3927655^2 + 2587614^2 .

It is a cyclic number.

It is not a de Polignac number, because 22122220012021 - 2¹¹ = 22122220009973 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 22122220012021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22122220012001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11061110006010 + 11061110006011.

It is an arithmetic number, because the mean of its divisors is an integer number (11061110006011).

Almost surely, 2^{22122220012021} is an apocalyptic number.

It is an amenable number.

22122220012021 is a deficient number, since it is larger than the sum of its proper divisors (1).

22122220012021 is an equidigital number, since it uses as much as digits as its factorization.

22122220012021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 22122220012021 its reverse (12021002222122), we get a palindrome (34143222234143).

The spelling of 22122220012021 in words is "twenty-two trillion, one hundred twenty-two billion, two hundred twenty million, twelve thousand, twenty-one".