22251340 has 12 divisors (see below), whose sum is σ = 46727856. Its totient is φ = 8900528.

The previous prime is 22251301. The next prime is 22251343. The reversal of 22251340 is 4315222.

It is not an unprimeable number, because it can be changed into a prime (22251343) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 556264 + ... + 556303.

It is an arithmetic number, because the mean of its divisors is an integer number (3893988).

Almost surely, 2^22251340 is an apocalyptic number.

22251340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22251340 is an abundant number, since it is smaller than the sum of its proper divisors (24476516).

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

22251340 is a wasteful number, since it uses less digits than its factorization.

22251340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1112576 (or 1112574 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 22251340 is about 4717.1326036057. The cubic root of 22251340 is about 281.2669625983.

Adding to 22251340 its reverse (4315222), we get a palindrome (26566562).

The spelling of 22251340 in words is "twenty-two million, two hundred fifty-one thousand, three hundred forty".