22202222020021 has 2 divisors, whose sum is σ = 22202222020022. Its totient is φ = 22202222020020.

The previous prime is 22202222020019. The next prime is 22202222020039. The reversal of 22202222020021 is 12002022220222.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17762094540100 + 4440127479921 = 4214510^2 + 2107161^2 .

It is a cyclic number.

It is not a de Polignac number, because 22202222020021 - 2¹ = 22202222020019 is a prime.

Together with 22202222020019, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22202222020091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11101111010010 + 11101111010011.

It is an arithmetic number, because the mean of its divisors is an integer number (11101111010011).

Almost surely, 2^{22202222020021} is an apocalyptic number.

It is an amenable number.

22202222020021 is a deficient number, since it is larger than the sum of its proper divisors (1).

22202222020021 is an equidigital number, since it uses as much as digits as its factorization.

22202222020021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 512, while the sum is 19.

Adding to 22202222020021 its reverse (12002022220222), we get a palindrome (34204244240243).

The spelling of 22202222020021 in words is "twenty-two trillion, two hundred two billion, two hundred twenty-two million, twenty thousand, twenty-one".