2155100100 has 36 divisors (see below), whose sum is σ = 6235423824. Its totient is φ = 574693280.

The previous prime is 2155100089. The next prime is 2155100107. The reversal of 2155100100 is 10015512.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 2155100100.

It is not an unprimeable number, because it can be changed into a prime (2155100107) 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 11 ways as a sum of consecutive naturals, for example, 3591534 + ... + 3592133.

Almost surely, 2^2155100100 is an apocalyptic number.

2155100100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2155100100 is an abundant number, since it is smaller than the sum of its proper divisors (4080323724).

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

2155100100 is a wasteful number, since it uses less digits than its factorization.

2155100100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7183684 (or 7183677 counting only the distinct ones).

The product of its (nonzero) digits is 50, while the sum is 15.

The square root of 2155100100 is about 46423.0556943422. The cubic root of 2155100100 is about 1291.6826189266.

Adding to 2155100100 its reverse (10015512), we get a palindrome (2165115612).

The spelling of 2155100100 in words is "two billion, one hundred fifty-five million, one hundred thousand, one hundred".