21856714 has 24 divisors (see below), whose sum is σ = 37025604. Its totient is φ = 9662400.

The previous prime is 21856697. The next prime is 21856733. The reversal of 21856714 is 41765812.

It can be written as a sum of positive squares in 2 ways, for example, as 21855625 + 1089 = 4675^2 + 33^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21856714.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7734 + ... + 10174.

Almost surely, 2^21856714 is an apocalyptic number.

21856714 is a deficient number, since it is larger than the sum of its proper divisors (15168890).

21856714 is a wasteful number, since it uses less digits than its factorization.

It is an anagram of its base 9 representation: 21856714 = (45112687)₉.

21856714 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2502 (or 2491 counting only the distinct ones).

The product of its digits is 13440, while the sum is 34.

The square root of 21856714 is about 4675.1164691374. The cubic root of 21856714 is about 279.5942848587.

The spelling of 21856714 in words is "twenty-one million, eight hundred fifty-six thousand, seven hundred fourteen".