22097521 has 2 divisors, whose sum is σ = 22097522. Its totient is φ = 22097520.

The previous prime is 22097519. The next prime is 22097539. The reversal of 22097521 is 12579022.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14145121 + 7952400 = 3761^2 + 2820^2 .

It is a cyclic number.

It is not a de Polignac number, because 22097521 - 2¹ = 22097519 is a prime.

Together with 22097519, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 22097521.

It is not a weakly prime, because it can be changed into another prime (22097561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11048760 + 11048761.

It is an arithmetic number, because the mean of its divisors is an integer number (11048761).

Almost surely, 2^22097521 is an apocalyptic number.

It is an amenable number.

22097521 is a deficient number, since it is larger than the sum of its proper divisors (1).

22097521 is an equidigital number, since it uses as much as digits as its factorization.

22097521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2520, while the sum is 28.

The square root of 22097521 is about 4700.8000382914. The cubic root of 22097521 is about 280.6173495896.

It can be divided in two parts, 2209 and 7521, that added together give a triangular number (9730 = T₁₃₉).

The spelling of 22097521 in words is "twenty-two million, ninety-seven thousand, five hundred twenty-one".