21242708 has 24 divisors (see below), whose sum is σ = 39334848. Its totient is φ = 10017216.

The previous prime is 21242681. The next prime is 21242713. The reversal of 21242708 is 80724212.

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, 5135 + ... + 8297.

It is an arithmetic number, because the mean of its divisors is an integer number (1638952).

Almost surely, 2^21242708 is an apocalyptic number.

It is an amenable number.

21242708 is a deficient number, since it is larger than the sum of its proper divisors (18092140).

21242708 is a wasteful number, since it uses less digits than its factorization.

21242708 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3263 (or 3261 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 26.

The square root of 21242708 is about 4608.9812323332. The cubic root of 21242708 is about 276.9512267127.

The spelling of 21242708 in words is "twenty-one million, two hundred forty-two thousand, seven hundred eight".