2155040100 has 144 divisors (see below), whose sum is σ = 6950944000. Its totient is φ = 572780160.

The previous prime is 2155040093. The next prime is 2155040101. The reversal of 2155040100 is 10405512.

2155040100 is a `hidden beast` number, since 215 + 50 + 401 + 0 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (2155040101) by changing a digit.

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 47 ways as a sum of consecutive naturals, for example, 941157 + ... + 943443.

Almost surely, 2^2155040100 is an apocalyptic number.

2155040100 is a gapful number since it is divisible by the number (20) 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 2155040100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3475472000).

2155040100 is an abundant number, since it is smaller than the sum of its proper divisors (4795903900).

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

2155040100 is a wasteful number, since it uses less digits than its factorization.

2155040100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2659 (or 2646 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 18.

The square root of 2155040100 is about 46422.4094592256. The cubic root of 2155040100 is about 1291.6706315984.

Adding to 2155040100 its reverse (10405512), we get a palindrome (2165445612).

The spelling of 2155040100 in words is "two billion, one hundred fifty-five million, forty thousand, one hundred".