21802252 has 12 divisors (see below), whose sum is σ = 39812976. Its totient is φ = 10427120.

The previous prime is 21802243. The next prime is 21802259. The reversal of 21802252 is 25220812.

It is not an unprimeable number, because it can be changed into a prime (21802259) 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 3 ways as a sum of consecutive naturals, for example, 118399 + ... + 118582.

It is an arithmetic number, because the mean of its divisors is an integer number (3317748).

Almost surely, 2^21802252 is an apocalyptic number.

It is an amenable number.

21802252 is a deficient number, since it is larger than the sum of its proper divisors (18010724).

21802252 is a wasteful number, since it uses less digits than its factorization.

21802252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 237008 (or 237006 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 22.

The square root of 21802252 is about 4669.2881684471. The cubic root of 21802252 is about 279.3618630788.

The spelling of 21802252 in words is "twenty-one million, eight hundred two thousand, two hundred fifty-two".