21303814 has 16 divisors (see below), whose sum is σ = 36622368. Its totient is φ = 9104832.

The previous prime is 21303797. The next prime is 21303817. The reversal of 21303814 is 41830312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21303817) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3642 + ... + 7474.

It is an arithmetic number, because the mean of its divisors is an integer number (2288898).

Almost surely, 2^21303814 is an apocalyptic number.

21303814 is a deficient number, since it is larger than the sum of its proper divisors (15318554).

21303814 is a wasteful number, since it uses less digits than its factorization.

21303814 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4239.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 21303814 is about 4615.6054857407. The cubic root of 21303814 is about 277.2165284259.

The spelling of 21303814 in words is "twenty-one million, three hundred three thousand, eight hundred fourteen".