22251388 has 12 divisors (see below), whose sum is σ = 38984400. Its totient is φ = 11112992.

The previous prime is 22251371. The next prime is 22251391. The reversal of 22251388 is 88315222.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1545 + ... + 6847.

It is an arithmetic number, because the mean of its divisors is an integer number (3248700).

Almost surely, 2^22251388 is an apocalyptic number.

It is an amenable number.

22251388 is a deficient number, since it is larger than the sum of its proper divisors (16733012).

22251388 is a wasteful number, since it uses less digits than its factorization.

22251388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6356 (or 6354 counting only the distinct ones).

The product of its digits is 7680, while the sum is 31.

The square root of 22251388 is about 4717.1376914396. The cubic root of 22251388 is about 281.2671648454.

The spelling of 22251388 in words is "twenty-two million, two hundred fifty-one thousand, three hundred eighty-eight".