22221656 has 16 divisors (see below), whose sum is σ = 43102800. Its totient is φ = 10727584.

The previous prime is 22221649. The next prime is 22221691. The reversal of 22221656 is 65612222.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47660 + ... + 48123.

It is an arithmetic number, because the mean of its divisors is an integer number (2693925).

Almost surely, 2^22221656 is an apocalyptic number.

It is an amenable number.

22221656 is a deficient number, since it is larger than the sum of its proper divisors (20881144).

22221656 is a wasteful number, since it uses less digits than its factorization.

22221656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95818 (or 95814 counting only the distinct ones).

The product of its digits is 2880, while the sum is 26.

The square root of 22221656 is about 4713.9851505918. The cubic root of 22221656 is about 281.1418338954.

Adding to 22221656 its reverse (65612222), we get a palindrome (87833878).

The spelling of 22221656 in words is "twenty-two million, two hundred twenty-one thousand, six hundred fifty-six".