22161556 has 12 divisors (see below), whose sum is σ = 38955168. Its totient is φ = 11031512.

The previous prime is 22161551. The next prime is 22161563. The reversal of 22161556 is 65516122.

It is a super-2 number, since 2×22161556² = 982269128682272, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22161551) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11296 + ... + 13111.

It is an arithmetic number, because the mean of its divisors is an integer number (3246264).

Almost surely, 2^22161556 is an apocalyptic number.

It is an amenable number.

22161556 is a deficient number, since it is larger than the sum of its proper divisors (16793612).

22161556 is a wasteful number, since it uses less digits than its factorization.

22161556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24638 (or 24636 counting only the distinct ones).

The product of its digits is 3600, while the sum is 28.

The square root of 22161556 is about 4707.6061857381. The cubic root of 22161556 is about 280.8881492339. Note that the first 3 decimals are identical.

Adding to 22161556 its reverse (65516122), we get a palindrome (87677678).

The spelling of 22161556 in words is "twenty-two million, one hundred sixty-one thousand, five hundred fifty-six".