21628714 has 8 divisors (see below), whose sum is σ = 32561028. Its totient is φ = 10775040.

The previous prime is 21628703. The next prime is 21628723. The reversal of 21628714 is 41782612.

It can be written as a sum of positive squares in 2 ways, for example, as 21464689 + 164025 = 4633^2 + 405^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18967 + ... + 20074.

Almost surely, 2^21628714 is an apocalyptic number.

21628714 is a deficient number, since it is larger than the sum of its proper divisors (10932314).

21628714 is a wasteful number, since it uses less digits than its factorization.

21628714 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39320.

The product of its digits is 5376, while the sum is 31.

The square root of 21628714 is about 4650.6681240441. The cubic root of 21628714 is about 278.6186814680.

The spelling of 21628714 in words is "twenty-one million, six hundred twenty-eight thousand, seven hundred fourteen".