16923715021 has 16 divisors (see below), whose sum is σ = 17852203008. Its totient is φ = 16019564400.

The previous prime is 16923715019. The next prime is 16923715063. The reversal of 16923715021 is 12051732961.

It is a cyclic number.

It is not a de Polignac number, because 16923715021 - 2¹ = 16923715019 is a prime.

It is a super-2 number, since 2×16923715021² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16923710021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3772846 + ... + 3777328.

It is an arithmetic number, because the mean of its divisors is an integer number (1115762688).

Almost surely, 2^16923715021 is an apocalyptic number.

It is an amenable number.

16923715021 is a deficient number, since it is larger than the sum of its proper divisors (928487987).

16923715021 is a wasteful number, since it uses less digits than its factorization.

16923715021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7152.

The product of its (nonzero) digits is 22680, while the sum is 37.

The spelling of 16923715021 in words is "sixteen billion, nine hundred twenty-three million, seven hundred fifteen thousand, twenty-one".