16123321321500 has 192 divisors, whose sum is σ = 49011431519232. Its totient is φ = 4111023136000.

The previous prime is 16123321321441. The next prime is 16123321321517. The reversal of 16123321321500 is 512312332161.

It is a super-2 number, since 2×16123321321500² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 90335347 + ... + 90513653.

It is an arithmetic number, because the mean of its divisors is an integer number (255267872496).

Almost surely, 2^{16123321321500} is an apocalyptic number.

16123321321500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16123321321500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24505715759616).

16123321321500 is an abundant number, since it is smaller than the sum of its proper divisors (32888110197732).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16123321321500 is a wasteful number, since it uses less digits than its factorization.

16123321321500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180973 (or 180961 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 30.

Adding to 16123321321500 its reverse (512312332161), we get a palindrome (16635633653661).

The spelling of 16123321321500 in words is "sixteen trillion, one hundred twenty-three billion, three hundred twenty-one million, three hundred twenty-one thousand, five hundred".