16921913 has 8 divisors (see below), whose sum is σ = 18294720. Its totient is φ = 15597360.

The previous prime is 16921907. The next prime is 16921921. The reversal of 16921913 is 31912961.

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

It is a cyclic number.

It is not a de Polignac number, because 16921913 - 2⁸ = 16921657 is a prime.

It is a super-2 number, since 2×16921913² = 572702279159138, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 16921913.

It is not an unprimeable number, because it can be changed into a prime (16921903) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11333 + ... + 12738.

It is an arithmetic number, because the mean of its divisors is an integer number (2286840).

Almost surely, 2^16921913 is an apocalyptic number.

It is an amenable number.

16921913 is a deficient number, since it is larger than the sum of its proper divisors (1372807).

16921913 is a wasteful number, since it uses less digits than its factorization.

16921913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24127.

The product of its digits is 2916, while the sum is 32.

The square root of 16921913 is about 4113.6252867756. The cubic root of 16921913 is about 256.7338612699.

The spelling of 16921913 in words is "sixteen million, nine hundred twenty-one thousand, nine hundred thirteen".