22021597 has 8 divisors (see below), whose sum is σ = 23934680. Its totient is φ = 20139840.

The previous prime is 22021591. The next prime is 22021621. The reversal of 22021597 is 79512022.

It can be written as a sum of positive squares in 4 ways, for example, as 4137156 + 17884441 = 2034^2 + 4229^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 22021597 - 2¹⁵ = 21988829 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22021591) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6354 + ... + 9187.

It is an arithmetic number, because the mean of its divisors is an integer number (2991835).

Almost surely, 2^22021597 is an apocalyptic number.

It is an amenable number.

22021597 is a deficient number, since it is larger than the sum of its proper divisors (1913083).

22021597 is a wasteful number, since it uses less digits than its factorization.

22021597 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15663.

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

The square root of 22021597 is about 4692.7174430174. The cubic root of 22021597 is about 280.2955934471.

The spelling of 22021597 in words is "twenty-two million, twenty-one thousand, five hundred ninety-seven".