21752324 has 24 divisors (see below), whose sum is σ = 42496608. Its totient is φ = 9656640.

The previous prime is 21752317. The next prime is 21752329. The reversal of 21752324 is 42325712.

It is a junction number, because it is equal to n+sod(n) for n = 21752293 and 21752302.

It is not an unprimeable number, because it can be changed into a prime (21752329) 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, 3857 + ... + 7640.

It is an arithmetic number, because the mean of its divisors is an integer number (1770692).

Almost surely, 2^21752324 is an apocalyptic number.

It is an amenable number.

21752324 is a deficient number, since it is larger than the sum of its proper divisors (20744284).

21752324 is a wasteful number, since it uses less digits than its factorization.

21752324 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11555 (or 11553 counting only the distinct ones).

The product of its digits is 3360, while the sum is 26.

The square root of 21752324 is about 4663.9386788422. The cubic root of 21752324 is about 279.1484502655.

The spelling of 21752324 in words is "twenty-one million, seven hundred fifty-two thousand, three hundred twenty-four".