21308914 has 16 divisors (see below), whose sum is σ = 35264160. Its totient is φ = 9576160.

The previous prime is 21308897. The next prime is 21308921. The reversal of 21308914 is 41980312.

It is a happy 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, 3484 + ... + 7399.

It is an arithmetic number, because the mean of its divisors is an integer number (2204010).

Almost surely, 2^21308914 is an apocalyptic number.

21308914 is a deficient number, since it is larger than the sum of its proper divisors (13955246).

21308914 is a wasteful number, since it uses less digits than its factorization.

21308914 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10985.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 21308914 is about 4616.1579262413. The cubic root of 21308914 is about 277.2386479627.

It can be divided in two parts, 21308 and 914, that added together give a palindrome (22222).

The spelling of 21308914 in words is "twenty-one million, three hundred eight thousand, nine hundred fourteen".