22163521 has 2 divisors, whose sum is σ = 22163522. Its totient is φ = 22163520.

The previous prime is 22163509. The next prime is 22163539. The reversal of 22163521 is 12536122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21902400 + 261121 = 4680^2 + 511^2 .

It is a cyclic number.

It is not a de Polignac number, because 22163521 - 2¹⁷ = 22032449 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 22163492 and 22163501.

It is not a weakly prime, because it can be changed into another prime (22163501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11081760 + 11081761.

It is an arithmetic number, because the mean of its divisors is an integer number (11081761).

Almost surely, 2^22163521 is an apocalyptic number.

It is an amenable number.

22163521 is a deficient number, since it is larger than the sum of its proper divisors (1).

22163521 is an equidigital number, since it uses as much as digits as its factorization.

22163521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 720, while the sum is 22.

The square root of 22163521 is about 4707.8148859104. The cubic root of 22163521 is about 280.8964508306.

Adding to 22163521 its reverse (12536122), we get a palindrome (34699643).

The spelling of 22163521 in words is "twenty-two million, one hundred sixty-three thousand, five hundred twenty-one".