22021888 has 36 divisors (see below), whose sum is σ = 50241520. Its totient is φ = 9437184.

The previous prime is 22021877. The next prime is 22021889. The reversal of 22021888 is 88812022.

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22021889) 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, 4353 + ... + 7936.

Almost surely, 2^22021888 is an apocalyptic number.

22021888 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

22021888 is an abundant number, since it is smaller than the sum of its proper divisors (28219632).

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

22021888 is an equidigital number, since it uses as much as digits as its factorization.

22021888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12312 (or 12298 counting only the distinct ones).

The product of its (nonzero) digits is 4096, while the sum is 31.

The square root of 22021888 is about 4692.7484484042. The cubic root of 22021888 is about 280.2968280784.

The spelling of 22021888 in words is "twenty-two million, twenty-one thousand, eight hundred eighty-eight".