22704221 has 4 divisors (see below), whose sum is σ = 23899200. Its totient is φ = 21509244.

The previous prime is 22704211. The next prime is 22704239. The reversal of 22704221 is 12240722.

It is a happy number.

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 a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22704221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22704193 and 22704202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22704211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 597461 + ... + 597498.

It is an arithmetic number, because the mean of its divisors is an integer number (5974800).

Almost surely, 2^22704221 is an apocalyptic number.

It is an amenable number.

22704221 is a deficient number, since it is larger than the sum of its proper divisors (1194979).

22704221 is a wasteful number, since it uses less digits than its factorization.

22704221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1194978.

The product of its (nonzero) digits is 448, while the sum is 20.

The square root of 22704221 is about 4764.8946473138. The cubic root of 22704221 is about 283.1623677546.

Adding to 22704221 its reverse (12240722), we get a palindrome (34944943).

The spelling of 22704221 in words is "twenty-two million, seven hundred four thousand, two hundred twenty-one".