22204221 has 16 divisors (see below), whose sum is σ = 32054400. Its totient is φ = 13590720.

The previous prime is 22204219. The next prime is 22204229. The reversal of 22204221 is 12240222.

It is not a de Polignac number, because 22204221 - 2¹ = 22204219 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 22204221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22204229) 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, 6331 + ... + 9191.

It is an arithmetic number, because the mean of its divisors is an integer number (2003400).

Almost surely, 2^22204221 is an apocalyptic number.

It is an amenable number.

22204221 is a deficient number, since it is larger than the sum of its proper divisors (9850179).

22204221 is a wasteful number, since it uses less digits than its factorization.

22204221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3076.

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

The square root of 22204221 is about 4712.1355031450. The cubic root of 22204221 is about 281.0682871656.

Adding to 22204221 its reverse (12240222), we get a palindrome (34444443).

It can be divided in two parts, 2220 and 4221, that added together give a triangular number (6441 = T₁₁₃).

The spelling of 22204221 in words is "twenty-two million, two hundred four thousand, two hundred twenty-one".