2155504100 has 18 divisors (see below), whose sum is σ = 4677444114. Its totient is φ = 862201600.

The previous prime is 2155504097. The next prime is 2155504157. The reversal of 2155504100 is 14055512.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 11999296 + 2143504804 = 3464^2 + 46298^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 10777421 + ... + 10777620.

Almost surely, 2^2155504100 is an apocalyptic number.

2155504100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2155504100 is an abundant number, since it is smaller than the sum of its proper divisors (2521940014).

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

2155504100 is a wasteful number, since it uses less digits than its factorization.

2155504100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21555055 (or 21555048 counting only the distinct ones).

The product of its (nonzero) digits is 1000, while the sum is 23.

The square root of 2155504100 is about 46427.4067766013. The cubic root of 2155504100 is about 1291.7633278108.

Adding to 2155504100 its reverse (14055512), we get a palindrome (2169559612).

The spelling of 2155504100 in words is "two billion, one hundred fifty-five million, five hundred four thousand, one hundred".