21707514 has 40 divisors (see below), whose sum is σ = 49693248. Its totient is φ = 7079400.

The previous prime is 21707507. The next prime is 21707537. The reversal of 21707514 is 41570712.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 6189 + ... + 9039.

Almost surely, 2^21707514 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21707514, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24846624).

21707514 is an abundant number, since it is smaller than the sum of its proper divisors (27985734).

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

21707514 is a wasteful number, since it uses less digits than its factorization.

21707514 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2912 (or 2903 counting only the distinct ones).

The product of its (nonzero) digits is 1960, while the sum is 27.

The square root of 21707514 is about 4659.1323226541. The cubic root of 21707514 is about 278.9566356467.

The spelling of 21707514 in words is "twenty-one million, seven hundred seven thousand, five hundred fourteen".