21521714 has 8 divisors (see below), whose sum is σ = 32725020. Its totient is φ = 10613376.

The previous prime is 21521701. The next prime is 21521743. The reversal of 21521714 is 41712512.

It can be written as a sum of positive squares in 2 ways, for example, as 20857489 + 664225 = 4567^2 + 815^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 21521714.

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, 73559 + ... + 73850.

Almost surely, 2^21521714 is an apocalyptic number.

21521714 is a deficient number, since it is larger than the sum of its proper divisors (11203306).

21521714 is a wasteful number, since it uses less digits than its factorization.

21521714 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147484.

The product of its digits is 560, while the sum is 23.

The square root of 21521714 is about 4639.1501376869. The cubic root of 21521714 is about 278.1584676975.

The spelling of 21521714 in words is "twenty-one million, five hundred twenty-one thousand, seven hundred fourteen".