21285395 has 8 divisors (see below), whose sum is σ = 25714800. Its totient is φ = 16913440.

The previous prime is 21285367. The next prime is 21285409. The reversal of 21285395 is 59358212.

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

It is not a de Polignac number, because 21285395 - 2⁶ = 21285331 is a prime.

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, 13541 + ... + 15030.

It is an arithmetic number, because the mean of its divisors is an integer number (3214350).

Almost surely, 2^21285395 is an apocalyptic number.

21285395 is a deficient number, since it is larger than the sum of its proper divisors (4429405).

21285395 is a wasteful number, since it uses less digits than its factorization.

21285395 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28725.

The product of its digits is 21600, while the sum is 35.

The square root of 21285395 is about 4613.6097580961. The cubic root of 21285395 is about 277.1366127907.

The spelling of 21285395 in words is "twenty-one million, two hundred eighty-five thousand, three hundred ninety-five".