22097221 has 4 divisors (see below), whose sum is σ = 22116652. Its totient is φ = 22077792.

The previous prime is 22097219. The next prime is 22097233. The reversal of 22097221 is 12279022.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2604996 + 19492225 = 1614^2 + 4415^2 .

It is a cyclic number.

It is not a de Polignac number, because 22097221 - 2¹ = 22097219 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 (22097291) 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 3 ways as a sum of consecutive naturals, for example, 7896 + ... + 10321.

It is an arithmetic number, because the mean of its divisors is an integer number (5529163).

Almost surely, 2^22097221 is an apocalyptic number.

It is an amenable number.

22097221 is a deficient number, since it is larger than the sum of its proper divisors (19431).

22097221 is a wasteful number, since it uses less digits than its factorization.

22097221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19430.

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 22097221 is about 4700.7681287211. The cubic root of 22097221 is about 280.6160796797.

The spelling of 22097221 in words is "twenty-two million, ninety-seven thousand, two hundred twenty-one".