21739314 has 16 divisors (see below), whose sum is σ = 43546752. Its totient is φ = 7235088.

The previous prime is 21739309. The next prime is 21739321. The reversal of 21739314 is 41393712.

It is a Curzon 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, 1927 + ... + 6869.

It is an arithmetic number, because the mean of its divisors is an integer number (2721672).

Almost surely, 2^21739314 is an apocalyptic number.

21739314 is an abundant number, since it is smaller than the sum of its proper divisors (21807438).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21739314 is a wasteful number, since it uses less digits than its factorization.

21739314 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5681.

The product of its digits is 4536, while the sum is 30.

The square root of 21739314 is about 4662.5437263365. The cubic root of 21739314 is about 279.0927865486.

The spelling of 21739314 in words is "twenty-one million, seven hundred thirty-nine thousand, three hundred fourteen".