21303885 has 8 divisors (see below), whose sum is σ = 34086240. Its totient is φ = 11362064.

The previous prime is 21303857. The next prime is 21303901. The reversal of 21303885 is 58830312.

It is a happy number.

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 21303885 - 2⁵ = 21303853 is a prime.

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, 710115 + ... + 710144.

It is an arithmetic number, because the mean of its divisors is an integer number (4260780).

Almost surely, 2^21303885 is an apocalyptic number.

It is an amenable number.

21303885 is a deficient number, since it is larger than the sum of its proper divisors (12782355).

21303885 is a wasteful number, since it uses less digits than its factorization.

21303885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1420267.

The product of its (nonzero) digits is 5760, while the sum is 30.

The square root of 21303885 is about 4615.6131770329. The cubic root of 21303885 is about 277.2168363888.

The spelling of 21303885 in words is "twenty-one million, three hundred three thousand, eight hundred eighty-five".