21730714 has 4 divisors (see below), whose sum is σ = 32596074. Its totient is φ = 10865356.

The previous prime is 21730693. The next prime is 21730727. The reversal of 21730714 is 41703712.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 17181025 + 4549689 = 4145^2 + 2133^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5432677 + ... + 5432680.

Almost surely, 2^21730714 is an apocalyptic number.

21730714 is a deficient number, since it is larger than the sum of its proper divisors (10865360).

21730714 is a wasteful number, since it uses less digits than its factorization.

21730714 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10865359.

The product of its (nonzero) digits is 1176, while the sum is 25.

The square root of 21730714 is about 4661.6213917477. The cubic root of 21730714 is about 279.0559789698.

The spelling of 21730714 in words is "twenty-one million, seven hundred thirty thousand, seven hundred fourteen".