221022204 has 24 divisors (see below), whose sum is σ = 555389520. Its totient is φ = 68006784.

The previous prime is 221022199. The next prime is 221022209. The reversal of 221022204 is 402220122.

It is an interprime number because it is at equal distance from previous prime (221022199) and next prime (221022209).

It is a super-2 number, since 2×221022204² = 97701629322035232, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221022209) 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, 708249 + ... + 708560.

It is an arithmetic number, because the mean of its divisors is an integer number (23141230).

Almost surely, 2^221022204 is an apocalyptic number.

It is an amenable number.

221022204 is an abundant number, since it is smaller than the sum of its proper divisors (334367316).

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

221022204 is a wasteful number, since it uses less digits than its factorization.

221022204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1416829 (or 1416827 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 15.

The square root of 221022204 is about 14866.8155298975. The cubic root of 221022204 is about 604.6146069068.

Adding to 221022204 its reverse (402220122), we get a palindrome (623242326).

The spelling of 221022204 in words is "two hundred twenty-one million, twenty-two thousand, two hundred four".