22221648 has 40 divisors (see below), whose sum is σ = 63785600. Its totient is φ = 7407072.

The previous prime is 22221599. The next prime is 22221649. The reversal of 22221648 is 84612222.

It is a happy number.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22221649) 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, 25288 + ... + 26151.

It is an arithmetic number, because the mean of its divisors is an integer number (1594640).

Almost surely, 2^22221648 is an apocalyptic number.

It is an amenable number.

22221648 is an abundant number, since it is smaller than the sum of its proper divisors (41563952).

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

22221648 is a wasteful number, since it uses less digits than its factorization.

22221648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51456 (or 51444 counting only the distinct ones).

The product of its digits is 3072, while the sum is 27.

The square root of 22221648 is about 4713.9843020528. The cubic root of 22221648 is about 281.1418001575.

The spelling of 22221648 in words is "twenty-two million, two hundred twenty-one thousand, six hundred forty-eight".