22251144 has 32 divisors (see below), whose sum is σ = 55815840. Its totient is φ = 7392000.

The previous prime is 22251137. The next prime is 22251161. The reversal of 22251144 is 44115222.

It is a super-2 number, since 2×22251144² = 990226818617472, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 22251144.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6544 + ... + 9344.

It is an arithmetic number, because the mean of its divisors is an integer number (1744245).

Almost surely, 2^22251144 is an apocalyptic number.

22251144 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

22251144 is an abundant number, since it is smaller than the sum of its proper divisors (33564696).

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

22251144 is a wasteful number, since it uses less digits than its factorization.

22251144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3141 (or 3137 counting only the distinct ones).

The product of its digits is 640, while the sum is 21.

The square root of 22251144 is about 4717.1118282271. Note that the first 3 decimals coincide. The cubic root of 22251144 is about 281.2661367531.

Adding to 22251144 its reverse (44115222), we get a palindrome (66366366).

The spelling of 22251144 in words is "twenty-two million, two hundred fifty-one thousand, one hundred forty-four".