21491714 has 8 divisors (see below), whose sum is σ = 32259708. Its totient is φ = 10738480.

The previous prime is 21491693. The next prime is 21491741. The reversal of 21491714 is 41719412.

It can be written as a sum of positive squares in 2 ways, for example, as 18190225 + 3301489 = 4265^2 + 1817^2 .

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, 1304 + ... + 6684.

Almost surely, 2^21491714 is an apocalyptic number.

21491714 is a deficient number, since it is larger than the sum of its proper divisors (10767994).

21491714 is a wasteful number, since it uses less digits than its factorization.

21491714 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7380.

The product of its digits is 2016, while the sum is 29.

The square root of 21491714 is about 4635.9156592846. The cubic root of 21491714 is about 278.0291620979.

The spelling of 21491714 in words is "twenty-one million, four hundred ninety-one thousand, seven hundred fourteen".