22530521021 has 2 divisors, whose sum is σ = 22530521022. Its totient is φ = 22530521020.

The previous prime is 22530520997. The next prime is 22530521047. The reversal of 22530521021 is 12012503522.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22287504100 + 243016921 = 149290^2 + 15589^2 .

It is a cyclic number.

It is not a de Polignac number, because 22530521021 - 2¹⁰ = 22530519997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22530521071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11265260510 + 11265260511.

It is an arithmetic number, because the mean of its divisors is an integer number (11265260511).

Almost surely, 2^22530521021 is an apocalyptic number.

It is an amenable number.

22530521021 is a deficient number, since it is larger than the sum of its proper divisors (1).

22530521021 is an equidigital number, since it uses as much as digits as its factorization.

22530521021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1200, while the sum is 23.

The spelling of 22530521021 in words is "twenty-two billion, five hundred thirty million, five hundred twenty-one thousand, twenty-one".