16921965 has 16 divisors (see below), whose sum is σ = 27216000. Its totient is φ = 8978112.

The previous prime is 16921937. The next prime is 16921969. The reversal of 16921965 is 56912961.

It is not a de Polignac number, because 16921965 - 2⁶ = 16921901 is a prime.

It is a super-2 number, since 2×16921965² = 572705798922450, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16921969) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 151 + ... + 5819.

It is an arithmetic number, because the mean of its divisors is an integer number (1701000).

Almost surely, 2^16921965 is an apocalyptic number.

16921965 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

16921965 is a deficient number, since it is larger than the sum of its proper divisors (10294035).

16921965 is a wasteful number, since it uses less digits than its factorization.

16921965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5876.

The product of its digits is 29160, while the sum is 39.

The square root of 16921965 is about 4113.6316072298. The cubic root of 16921965 is about 256.7341242455.

The spelling of 16921965 in words is "sixteen million, nine hundred twenty-one thousand, nine hundred sixty-five".