22102221 has 4 divisors (see below), whose sum is σ = 29469632. Its totient is φ = 14734812.

The previous prime is 22102217. The next prime is 22102237. The reversal of 22102221 is 12220122.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 22102221 - 2² = 22102217 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22102197 and 22102206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22102211) 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, 3683701 + ... + 3683706.

It is an arithmetic number, because the mean of its divisors is an integer number (7367408).

Almost surely, 2^22102221 is an apocalyptic number.

It is an amenable number.

22102221 is a deficient number, since it is larger than the sum of its proper divisors (7367411).

22102221 is an equidigital number, since it uses as much as digits as its factorization.

22102221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7367410.

The product of its (nonzero) digits is 32, while the sum is 12.

The square root of 22102221 is about 4701.2999266160. The cubic root of 22102221 is about 280.6372433452.

Adding to 22102221 its reverse (12220122), we get a palindrome (34322343).

The spelling of 22102221 in words is "twenty-two million, one hundred two thousand, two hundred twenty-one".