16957821123 has 32 divisors (see below), whose sum is σ = 25655097600. Its totient is φ = 11067235200.

The previous prime is 16957821103. The next prime is 16957821173. The reversal of 16957821123 is 32112875961.

16957821123 is a `hidden beast` number, since 1 + 69 + 578 + 2 + 1 + 12 + 3 = 666.

It is not a de Polignac number, because 16957821123 - 2⁵ = 16957821091 is a prime.

It is a super-2 number, since 2×16957821123² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (16957821103) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 361828 + ... + 405998.

It is an arithmetic number, because the mean of its divisors is an integer number (801721800).

Almost surely, 2^16957821123 is an apocalyptic number.

16957821123 is a deficient number, since it is larger than the sum of its proper divisors (8697276477).

16957821123 is a wasteful number, since it uses less digits than its factorization.

16957821123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44480 (or 44474 counting only the distinct ones).

The product of its digits is 181440, while the sum is 45.

The spelling of 16957821123 in words is "sixteen billion, nine hundred fifty-seven million, eight hundred twenty-one thousand, one hundred twenty-three".