16521161123 has 8 divisors (see below), whose sum is σ = 16565812560. Its totient is φ = 16476536160.

The previous prime is 16521161087. The next prime is 16521161131. The reversal of 16521161123 is 32116112561.

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 16521161123 - 2¹² = 16521157027 is a prime.

It is a super-2 number, since 2×16521161123² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16521161183) 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, 2125961 + ... + 2133717.

It is an arithmetic number, because the mean of its divisors is an integer number (2070726570).

Almost surely, 2^16521161123 is an apocalyptic number.

16521161123 is a deficient number, since it is larger than the sum of its proper divisors (44651437).

16521161123 is an equidigital number, since it uses as much as digits as its factorization.

16521161123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13237.

The product of its digits is 2160, while the sum is 29.

Adding to 16521161123 its reverse (32116112561), we get a palindrome (48637273684).

The spelling of 16521161123 in words is "sixteen billion, five hundred twenty-one million, one hundred sixty-one thousand, one hundred twenty-three".