22221788 has 36 divisors (see below), whose sum is σ = 42292320. Its totient is φ = 10209792.

The previous prime is 22221781. The next prime is 22221799. The reversal of 22221788 is 88712222.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22221781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 54128 + ... + 54536.

Almost surely, 2^22221788 is an apocalyptic number.

It is an amenable number.

22221788 is a deficient number, since it is larger than the sum of its proper divisors (20070532).

22221788 is a wasteful number, since it uses less digits than its factorization.

22221788 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 494 (or 475 counting only the distinct ones).

The product of its digits is 7168, while the sum is 32.

The square root of 22221788 is about 4713.9991514636. Note that the first 3 decimals coincide. The cubic root of 22221788 is about 281.1423905693.

The spelling of 22221788 in words is "twenty-two million, two hundred twenty-one thousand, seven hundred eighty-eight".