22437221 has 2 divisors, whose sum is σ = 22437222. Its totient is φ = 22437220.

The previous prime is 22437199. The next prime is 22437253. The reversal of 22437221 is 12273422.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13586596 + 8850625 = 3686^2 + 2975^2 .

It is a cyclic number.

It is not a de Polignac number, because 22437221 - 2¹⁸ = 22175077 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22437421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11218610 + 11218611.

It is an arithmetic number, because the mean of its divisors is an integer number (11218611).

Almost surely, 2^22437221 is an apocalyptic number.

It is an amenable number.

22437221 is a deficient number, since it is larger than the sum of its proper divisors (1).

22437221 is an equidigital number, since it uses as much as digits as its factorization.

22437221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1344, while the sum is 23.

The square root of 22437221 is about 4736.7943801689. The cubic root of 22437221 is about 282.0479983017.

The spelling of 22437221 in words is "twenty-two million, four hundred thirty-seven thousand, two hundred twenty-one".