21382285 has 8 divisors (see below), whose sum is σ = 25908480. Its totient is φ = 16939344.

The previous prime is 21382271. The next prime is 21382297. The reversal of 21382285 is 58228312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21382285 - 2²³ = 12993677 is a prime.

It is a super-2 number, since 2×21382285² = 914404223642450, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20245 + ... + 21274.

It is an arithmetic number, because the mean of its divisors is an integer number (3238560).

Almost surely, 2^21382285 is an apocalyptic number.

It is an amenable number.

21382285 is a deficient number, since it is larger than the sum of its proper divisors (4526195).

21382285 is a wasteful number, since it uses less digits than its factorization.

21382285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41627.

The product of its digits is 7680, while the sum is 31.

The square root of 21382285 is about 4624.0982904778. The cubic root of 21382285 is about 277.5564801305.

The spelling of 21382285 in words is "twenty-one million, three hundred eighty-two thousand, two hundred eighty-five".