21698714 has 4 divisors (see below), whose sum is σ = 32548074. Its totient is φ = 10849356.

The previous prime is 21698713. The next prime is 21698731. The reversal of 21698714 is 41789612.

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., 16933225 + 4765489 = 4115^2 + 2183^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21698711) by changing a digit.

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 as a sum of consecutive naturals, namely, 5424677 + ... + 5424680.

Almost surely, 2^21698714 is an apocalyptic number.

21698714 is a deficient number, since it is larger than the sum of its proper divisors (10849360).

21698714 is a wasteful number, since it uses less digits than its factorization.

21698714 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10849359.

The product of its digits is 24192, while the sum is 38.

The square root of 21698714 is about 4658.1878450745. The cubic root of 21698714 is about 278.9189351806.

The spelling of 21698714 in words is "twenty-one million, six hundred ninety-eight thousand, seven hundred fourteen".