21282285 has 16 divisors (see below), whose sum is σ = 34405056. Its totient is φ = 11232768.

The previous prime is 21282269. The next prime is 21282301. The reversal of 21282285 is 58228212.

It is an interprime number because it is at equal distance from previous prime (21282269) and next prime (21282301).

It is not a de Polignac number, because 21282285 - 2⁴ = 21282269 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5859 + ... + 8768.

It is an arithmetic number, because the mean of its divisors is an integer number (2150316).

Almost surely, 2^21282285 is an apocalyptic number.

It is an amenable number.

21282285 is a deficient number, since it is larger than the sum of its proper divisors (13122771).

21282285 is a wasteful number, since it uses less digits than its factorization.

21282285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14732.

The product of its digits is 5120, while the sum is 30.

The square root of 21282285 is about 4613.2726995052. The cubic root of 21282285 is about 277.1231146958.

The spelling of 21282285 in words is "twenty-one million, two hundred eighty-two thousand, two hundred eighty-five".