21342885 has 16 divisors (see below), whose sum is σ = 34250496. Its totient is φ = 11348928.

The previous prime is 21342883. The next prime is 21342887. The reversal of 21342885 is 58824312.

It is an interprime number because it is at equal distance from previous prime (21342883) and next prime (21342887).

It is not a de Polignac number, because 21342885 - 2¹ = 21342883 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21342883) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3567 + ... + 7443.

It is an arithmetic number, because the mean of its divisors is an integer number (2140656).

Almost surely, 2^21342885 is an apocalyptic number.

It is an amenable number.

21342885 is a deficient number, since it is larger than the sum of its proper divisors (12907611).

21342885 is a wasteful number, since it uses less digits than its factorization.

21342885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4252.

The product of its digits is 15360, while the sum is 33.

The square root of 21342885 is about 4619.8360360515. The cubic root of 21342885 is about 277.3858957878.

The spelling of 21342885 in words is "twenty-one million, three hundred forty-two thousand, eight hundred eighty-five".