16021917 has 12 divisors (see below), whose sum is σ = 23179104. Its totient is φ = 10664520.

The previous prime is 16021903. The next prime is 16021919. The reversal of 16021917 is 71912061.

It is a de Polignac number, because none of the positive numbers 2^k-16021917 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16021919) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7942 + ... + 9752.

It is an arithmetic number, because the mean of its divisors is an integer number (1931592).

Almost surely, 2^16021917 is an apocalyptic number.

It is an amenable number.

16021917 is a deficient number, since it is larger than the sum of its proper divisors (7157187).

16021917 is a wasteful number, since it uses less digits than its factorization.

16021917 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2800 (or 2797 counting only the distinct ones).

The product of its (nonzero) digits is 756, while the sum is 27.

The square root of 16021917 is about 4002.7386874489. The cubic root of 16021917 is about 252.0992145236.

Adding to 16021917 its reverse (71912061), we get a palindrome (87933978).

The spelling of 16021917 in words is "sixteen million, twenty-one thousand, nine hundred seventeen".