21760252 has 12 divisors (see below), whose sum is σ = 38273200. Its totient is φ = 10825056.

The previous prime is 21760247. The next prime is 21760261. The reversal of 21760252 is 25206712.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 12873 + ... + 14464.

Almost surely, 2^21760252 is an apocalyptic number.

It is an amenable number.

21760252 is a deficient number, since it is larger than the sum of its proper divisors (16512948).

21760252 is a wasteful number, since it uses less digits than its factorization.

21760252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27540 (or 27538 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 25.

The square root of 21760252 is about 4664.7885268252. The cubic root of 21760252 is about 279.1823595941.

Adding to 21760252 its reverse (25206712), we get a palindrome (46966964).

The spelling of 21760252 in words is "twenty-one million, seven hundred sixty thousand, two hundred fifty-two".