21317914 has 8 divisors (see below), whose sum is σ = 32501268. Its totient is φ = 10484160.

The previous prime is 21317899. The next prime is 21317921. The reversal of 21317914 is 41971312.

It can be written as a sum of positive squares in 2 ways, for example, as 21316689 + 1225 = 4617^2 + 35^2 .

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

It is a super-2 number, since 2×21317914² = 908906914622792, which contains 22 as substring.

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, 87247 + ... + 87490.

Almost surely, 2^21317914 is an apocalyptic number.

21317914 is a deficient number, since it is larger than the sum of its proper divisors (11183354).

21317914 is a wasteful number, since it uses less digits than its factorization.

21317914 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174800.

The product of its digits is 1512, while the sum is 28.

The square root of 21317914 is about 4617.1326599958. The cubic root of 21317914 is about 277.2776738313.

The spelling of 21317914 in words is "twenty-one million, three hundred seventeen thousand, nine hundred fourteen".