22161988 has 6 divisors (see below), whose sum is σ = 38783486. Its totient is φ = 11080992.

The previous prime is 22161977. The next prime is 22161991. The reversal of 22161988 is 88916122.

It can be written as a sum of positive squares in only one way, i.e., 16630084 + 5531904 = 4078^2 + 2352^2 .

It is a super-2 number, since 2×22161988² = 982307424224288, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2770245 + ... + 2770252.

Almost surely, 2^22161988 is an apocalyptic number.

It is an amenable number.

22161988 is a deficient number, since it is larger than the sum of its proper divisors (16621498).

22161988 is a wasteful number, since it uses less digits than its factorization.

22161988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5540501 (or 5540499 counting only the distinct ones).

The product of its digits is 13824, while the sum is 37.

The square root of 22161988 is about 4707.6520687069. The cubic root of 22161988 is about 280.8899743598.

The spelling of 22161988 in words is "twenty-two million, one hundred sixty-one thousand, nine hundred eighty-eight".