22704021 has 6 divisors (see below), whose sum is σ = 32794710. Its totient is φ = 15136008.

The previous prime is 22704007. The next prime is 22704023. The reversal of 22704021 is 12040722.

It can be written as a sum of positive squares in only one way, i.e., 13793796 + 8910225 = 3714^2 + 2985^2 .

It is not a de Polignac number, because 22704021 - 2¹⁰ = 22702997 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 22703985 and 22704003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22704023) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1261326 + ... + 1261343.

It is an arithmetic number, because the mean of its divisors is an integer number (5465785).

Almost surely, 2^22704021 is an apocalyptic number.

It is an amenable number.

22704021 is a deficient number, since it is larger than the sum of its proper divisors (10090689).

22704021 is a wasteful number, since it uses less digits than its factorization.

22704021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2522675 (or 2522672 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 18.

The square root of 22704021 is about 4764.8736604447. The cubic root of 22704021 is about 283.1615362992.

Adding to 22704021 its reverse (12040722), we get a palindrome (34744743).

The spelling of 22704021 in words is "twenty-two million, seven hundred four thousand, twenty-one".