5156721100 has 72 divisors (see below), whose sum is σ = 11374928208. Its totient is φ = 2028902400.

The previous prime is 5156721047. The next prime is 5156721109. The reversal of 5156721100 is 11276515.

It is not an unprimeable number, because it can be changed into a prime (5156721109) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 1546435 + ... + 1549765.

It is an arithmetic number, because the mean of its divisors is an integer number (157985114).

Almost surely, 2^5156721100 is an apocalyptic number.

5156721100 is a gapful number since it is divisible by the number (50) 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 5156721100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5687464104).

5156721100 is an abundant number, since it is smaller than the sum of its proper divisors (6218207108).

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

5156721100 is a wasteful number, since it uses less digits than its factorization.

5156721100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3595 (or 3588 counting only the distinct ones).

The product of its (nonzero) digits is 2100, while the sum is 28.

The square root of 5156721100 is about 71810.3133261511. The cubic root of 5156721100 is about 1727.6584200481.

Adding to 5156721100 its reverse (11276515), we get a palindrome (5167997615).

The spelling of 5156721100 in words is "five billion, one hundred fifty-six million, seven hundred twenty-one thousand, one hundred".