21285022 has 8 divisors (see below), whose sum is σ = 34830072. Its totient is φ = 9675000.

The previous prime is 21285013. The next prime is 21285023. The reversal of 21285022 is 22058212.

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

It is a Harshad number since it is a multiple of its sum of digits (22), and also a Moran number because the ratio is a prime number: 967501 = 21285022 / (2 + 1 + 2 + 8 + 5 + 0 + 2 + 2).

It is a junction number, because it is equal to n+sod(n) for n = 21284984 and 21285002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21285023) 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, 483729 + ... + 483772.

It is an arithmetic number, because the mean of its divisors is an integer number (4353759).

Almost surely, 2^21285022 is an apocalyptic number.

21285022 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21285022 is a deficient number, since it is larger than the sum of its proper divisors (13545050).

21285022 is a wasteful number, since it uses less digits than its factorization.

21285022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 967514.

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

The square root of 21285022 is about 4613.5693340406. The cubic root of 21285022 is about 277.1349939567.

The spelling of 21285022 in words is "twenty-one million, two hundred eighty-five thousand, twenty-two".