22442240021 has 2 divisors, whose sum is σ = 22442240022. Its totient is φ = 22442240020.

The previous prime is 22442239969. The next prime is 22442240033. The reversal of 22442240021 is 12004224422.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12524071921 + 9918168100 = 111911^2 + 99590^2 .

It is a cyclic number.

It is not a de Polignac number, because 22442240021 - 2²² = 22438045717 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22442240321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11221120010 + 11221120011.

It is an arithmetic number, because the mean of its divisors is an integer number (11221120011).

Almost surely, 2^22442240021 is an apocalyptic number.

It is an amenable number.

22442240021 is a deficient number, since it is larger than the sum of its proper divisors (1).

22442240021 is an equidigital number, since it uses as much as digits as its factorization.

22442240021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2048, while the sum is 23.

Adding to 22442240021 its reverse (12004224422), we get a palindrome (34446464443).

The spelling of 22442240021 in words is "twenty-two billion, four hundred forty-two million, two hundred forty thousand, twenty-one".