22100221 has 16 divisors (see below), whose sum is σ = 27494208. Its totient is φ = 17452800.

The previous prime is 22100219. The next prime is 22100227. The reversal of 22100221 is 12200122.

It is a cyclic number.

It is not a de Polignac number, because 22100221 - 2¹ = 22100219 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22100198 and 22100207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22100227) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2115 + ... + 6976.

It is an arithmetic number, because the mean of its divisors is an integer number (1718388).

Almost surely, 2^22100221 is an apocalyptic number.

It is an amenable number.

22100221 is a deficient number, since it is larger than the sum of its proper divisors (5393987).

22100221 is a wasteful number, since it uses less digits than its factorization.

22100221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9132.

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 22100221 is about 4701.0872146770. The cubic root of 22100221 is about 280.6287782621.

Adding to 22100221 its reverse (12200122), we get a palindrome (34300343).

Subtracting from 22100221 its reverse (12200122), we obtain a palindrome (9900099).

It can be divided in two parts, 22100 and 221, that multiplied together give a square (4884100 = 2210²).

The spelling of 22100221 in words is "twenty-two million, one hundred thousand, two hundred twenty-one".