21995282 has 16 divisors (see below), whose sum is σ = 34522200. Its totient is φ = 10496640.

The previous prime is 21995243. The next prime is 21995287. The reversal of 21995282 is 28259912.

It can be written as a sum of positive squares in 4 ways, for example, as 20693401 + 1301881 = 4549^2 + 1141^2 .

It is not an unprimeable number, because it can be changed into a prime (21995287) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3032 + ... + 7292.

Almost surely, 2^21995282 is an apocalyptic number.

21995282 is a deficient number, since it is larger than the sum of its proper divisors (12526918).

21995282 is a wasteful number, since it uses less digits than its factorization.

21995282 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4381.

The product of its digits is 25920, while the sum is 38.

The square root of 21995282 is about 4689.9127923662. The cubic root of 21995282 is about 280.1839012978.

The spelling of 21995282 in words is "twenty-one million, nine hundred ninety-five thousand, two hundred eighty-two".