22721244 has 48 divisors (see below), whose sum is σ = 65253888. Its totient is φ = 5992128.

The previous prime is 22721227. The next prime is 22721261. The reversal of 22721244 is 44212722.

It is an interprime number because it is at equal distance from previous prime (22721227) and next prime (22721261).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9312 + ... + 11495.

It is an arithmetic number, because the mean of its divisors is an integer number (1359456).

Almost surely, 2^22721244 is an apocalyptic number.

It is an amenable number.

22721244 is an abundant number, since it is smaller than the sum of its proper divisors (42532644).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

22721244 is a wasteful number, since it uses less digits than its factorization.

22721244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20834 (or 20832 counting only the distinct ones).

The product of its digits is 1792, while the sum is 24.

The square root of 22721244 is about 4766.6806060402. The cubic root of 22721244 is about 283.2331191916.

Adding to 22721244 its reverse (44212722), we get a palindrome (66933966).

The spelling of 22721244 in words is "twenty-two million, seven hundred twenty-one thousand, two hundred forty-four".