22113521 has 2 divisors, whose sum is σ = 22113522. Its totient is φ = 22113520.

The previous prime is 22113503. The next prime is 22113529. The reversal of 22113521 is 12531122.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17430625 + 4682896 = 4175^2 + 2164^2 .

It is a cyclic number.

It is not a de Polignac number, because 22113521 - 2¹⁸ = 21851377 is a prime.

It is a super-2 number, since 2×22113521² = 978015622034882, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 22113521.

It is not a weakly prime, because it can be changed into another prime (22113529) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11056760 + 11056761.

It is an arithmetic number, because the mean of its divisors is an integer number (11056761).

Almost surely, 2^22113521 is an apocalyptic number.

It is an amenable number.

22113521 is a deficient number, since it is larger than the sum of its proper divisors (1).

22113521 is an equidigital number, since it uses as much as digits as its factorization.

22113521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 120, while the sum is 17.

The square root of 22113521 is about 4702.5015683145. The cubic root of 22113521 is about 280.6850614743.

Adding to 22113521 its reverse (12531122), we get a palindrome (34644643).

The spelling of 22113521 in words is "twenty-two million, one hundred thirteen thousand, five hundred twenty-one".