22251040 has 48 divisors (see below), whose sum is σ = 60080832. Its totient is φ = 7628544.

The previous prime is 22251037. The next prime is 22251041. The reversal of 22251040 is 4015222.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is not an unprimeable number, because it can be changed into a prime (22251041) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8814 + ... + 11053.

It is an arithmetic number, because the mean of its divisors is an integer number (1251684).

Almost surely, 2^22251040 is an apocalyptic number.

22251040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22251040 is an abundant number, since it is smaller than the sum of its proper divisors (37829792).

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

22251040 is a wasteful number, since it uses less digits than its factorization.

22251040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19889 (or 19881 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 16.

The square root of 22251040 is about 4717.1008045197. The cubic root of 22251040 is about 281.2656985476.

Adding to 22251040 its reverse (4015222), we get a palindrome (26266262).

The spelling of 22251040 in words is "twenty-two million, two hundred fifty-one thousand, forty".