22161724 has 24 divisors (see below), whose sum is σ = 42396368. Its totient is φ = 10074240.

The previous prime is 22161721. The next prime is 22161751. The reversal of 22161724 is 42716122.

It is a super-2 number, since 2×22161724² = 982284021304352, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22161721) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 304 + ... + 6664.

Almost surely, 2^22161724 is an apocalyptic number.

It is an amenable number.

22161724 is a deficient number, since it is larger than the sum of its proper divisors (20234644).

22161724 is a wasteful number, since it uses less digits than its factorization.

22161724 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6445 (or 6443 counting only the distinct ones).

The product of its digits is 1344, while the sum is 25.

The square root of 22161724 is about 4707.6240291680. The cubic root of 22161724 is about 280.8888590079. Note that the first 4 decimals are identical.

Adding to 22161724 its reverse (42716122), we get a palindrome (64877846).

It can be divided in two parts, 2216172 and 4, that multiplied together give a palindrome (8864688).

The spelling of 22161724 in words is "twenty-two million, one hundred sixty-one thousand, seven hundred twenty-four".