22111121120021 has 2 divisors, whose sum is σ = 22111121120022. Its totient is φ = 22111121120020.

The previous prime is 22111121119999. The next prime is 22111121120041. The reversal of 22111121120021 is 12002112111122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19688397739921 + 2422723380100 = 4437161^2 + 1556510^2 .

It is a cyclic number.

It is not a de Polignac number, because 22111121120021 - 2³⁴ = 22093941250837 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22111121120041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11055560560010 + 11055560560011.

It is an arithmetic number, because the mean of its divisors is an integer number (11055560560011).

Almost surely, 2^{22111121120021} is an apocalyptic number.

It is an amenable number.

22111121120021 is a deficient number, since it is larger than the sum of its proper divisors (1).

22111121120021 is an equidigital number, since it uses as much as digits as its factorization.

22111121120021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 22111121120021 its reverse (12002112111122), we get a palindrome (34113233231143).

The spelling of 22111121120021 in words is "twenty-two trillion, one hundred eleven billion, one hundred twenty-one million, one hundred twenty thousand, twenty-one".