16021112500 has 72 divisors (see below), whose sum is σ = 35440153560. Its totient is φ = 6336000000.

The previous prime is 16021112489. The next prime is 16021112501. The reversal of 16021112500 is 521112061.

It can be written as a sum of positive squares in 12 ways, for example, as 14990574096 + 1030538404 = 122436^2 + 32102^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16021112501) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1105300 + ... + 1119700.

It is an arithmetic number, because the mean of its divisors is an integer number (492224355).

Almost surely, 2^16021112500 is an apocalyptic number.

16021112500 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 16021112500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17720076780).

16021112500 is an abundant number, since it is smaller than the sum of its proper divisors (19419041060).

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

16021112500 is an equidigital number, since it uses as much as digits as its factorization.

16021112500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14519 (or 14497 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 19.

Adding to 16021112500 its reverse (521112061), we get a palindrome (16542224561).

The spelling of 16021112500 in words is "sixteen billion, twenty-one million, one hundred twelve thousand, five hundred".