21057714 has 12 divisors (see below), whose sum is σ = 45625086. Its totient is φ = 7019232.

The previous prime is 21057709. The next prime is 21057727. The reversal of 21057714 is 41775012.

It can be written as a sum of positive squares in only one way, i.e., 20657025 + 400689 = 4545^2 + 633^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 584919 + ... + 584954.

Almost surely, 2^21057714 is an apocalyptic number.

21057714 is an abundant number, since it is smaller than the sum of its proper divisors (24567372).

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

21057714 is a wasteful number, since it uses less digits than its factorization.

21057714 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1169881 (or 1169878 counting only the distinct ones).

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

The square root of 21057714 is about 4588.8684879826. The cubic root of 21057714 is about 276.1449301837.

The spelling of 21057714 in words is "twenty-one million, fifty-seven thousand, seven hundred fourteen".