22221790 has 16 divisors (see below), whose sum is σ = 40247568. Its totient is φ = 8833536.

The previous prime is 22221781. The next prime is 22221799. The reversal of 22221790 is 9712222.

It is an interprime number because it is at equal distance from previous prime (22221781) and next prime (22221799).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22221799) 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, 5187 + ... + 8446.

It is an arithmetic number, because the mean of its divisors is an integer number (2515473).

Almost surely, 2^22221790 is an apocalyptic number.

22221790 is a deficient number, since it is larger than the sum of its proper divisors (18025778).

22221790 is a wasteful number, since it uses less digits than its factorization.

22221790 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13803.

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 22221790 is about 4713.9993635978. Note that the first 3 decimals coincide. The cubic root of 22221790 is about 281.1423990037.

The spelling of 22221790 in words is "twenty-two million, two hundred twenty-one thousand, seven hundred ninety".