22563521 has 2 divisors, whose sum is σ = 22563522. Its totient is φ = 22563520.

The previous prime is 22563511. The next prime is 22563533. The reversal of 22563521 is 12536522.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16313521 + 6250000 = 4039^2 + 2500^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22563521 is a prime.

It is a super-2 number, since 2×22563521² = 1018224959834882, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (22563511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11281760 + 11281761.

It is an arithmetic number, because the mean of its divisors is an integer number (11281761).

Almost surely, 2^22563521 is an apocalyptic number.

It is an amenable number.

22563521 is a deficient number, since it is larger than the sum of its proper divisors (1).

22563521 is an equidigital number, since it uses as much as digits as its factorization.

22563521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3600, while the sum is 26.

The square root of 22563521 is about 4750.1074724684. The cubic root of 22563521 is about 282.5762281566.

The spelling of 22563521 in words is "twenty-two million, five hundred sixty-three thousand, five hundred twenty-one".