21733172 has 6 divisors (see below), whose sum is σ = 38033058. Its totient is φ = 10866584.

The previous prime is 21733109. The next prime is 21733193. The reversal of 21733172 is 27133712.

It can be written as a sum of positive squares in only one way, i.e., 17255716 + 4477456 = 4154^2 + 2116^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2716643 + ... + 2716650.

It is an arithmetic number, because the mean of its divisors is an integer number (6338843).

Almost surely, 2^21733172 is an apocalyptic number.

It is an amenable number.

21733172 is a deficient number, since it is larger than the sum of its proper divisors (16299886).

21733172 is a wasteful number, since it uses less digits than its factorization.

21733172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5433297 (or 5433295 counting only the distinct ones).

The product of its digits is 1764, while the sum is 26.

The square root of 21733172 is about 4661.8850264673. The cubic root of 21733172 is about 279.0665000804.

Adding to 21733172 its reverse (27133712), we get a palindrome (48866884).

The spelling of 21733172 in words is "twenty-one million, seven hundred thirty-three thousand, one hundred seventy-two".