21317496 has 32 divisors (see below), whose sum is σ = 53849040. Its totient is φ = 7031808.

The previous prime is 21317479. The next prime is 21317509. The reversal of 21317496 is 69471312.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2251 + ... + 6906.

Almost surely, 2^21317496 is an apocalyptic number.

It is an amenable number.

21317496 is an abundant number, since it is smaller than the sum of its proper divisors (32531544).

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

21317496 is a wasteful number, since it uses less digits than its factorization.

21317496 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9263 (or 9259 counting only the distinct ones).

The product of its digits is 9072, while the sum is 33.

The square root of 21317496 is about 4617.0873935848. The cubic root of 21317496 is about 277.2758615397.

The spelling of 21317496 in words is "twenty-one million, three hundred seventeen thousand, four hundred ninety-six".