22161850 has 12 divisors (see below), whose sum is σ = 41221134. Its totient is φ = 8864720.

The previous prime is 22161833. The next prime is 22161859. The reversal of 22161850 is 5816122.

It can be written as a sum of positive squares in 3 ways, for example, as 19018321 + 3143529 = 4361^2 + 1773^2 .

It is a super-2 number, since 2×22161850² = 982295190845000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is not an unprimeable number, because it can be changed into a prime (22161859) 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, 221569 + ... + 221668.

Almost surely, 2^22161850 is an apocalyptic number.

22161850 is a deficient number, since it is larger than the sum of its proper divisors (19059284).

22161850 is a wasteful number, since it uses less digits than its factorization.

22161850 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 443249 (or 443244 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 25.

The square root of 22161850 is about 4707.6374116960. The cubic root of 22161850 is about 280.8893913361.

Adding to 22161850 its reverse (5816122), we get a palindrome (27977972).

The spelling of 22161850 in words is "twenty-two million, one hundred sixty-one thousand, eight hundred fifty".