22737221 has 8 divisors (see below), whose sum is σ = 24730104. Its totient is φ = 20779200.

The previous prime is 22737199. The next prime is 22737223. The reversal of 22737221 is 12273722.

It can be written as a sum of positive squares in 4 ways, for example, as 9084196 + 13653025 = 3014^2 + 3695^2 .

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

It is not a de Polignac number, because 22737221 - 2¹⁴ = 22720837 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 (22737223) 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 in 7 ways as a sum of consecutive naturals, for example, 7346 + ... + 9971.

It is an arithmetic number, because the mean of its divisors is an integer number (3091263).

Almost surely, 2^22737221 is an apocalyptic number.

It is an amenable number.

22737221 is a deficient number, since it is larger than the sum of its proper divisors (1992883).

22737221 is a wasteful number, since it uses less digits than its factorization.

22737221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17431.

The product of its digits is 2352, while the sum is 26.

The square root of 22737221 is about 4768.3562157205. The cubic root of 22737221 is about 283.2994910752.

The spelling of 22737221 in words is "twenty-two million, seven hundred thirty-seven thousand, two hundred twenty-one".