2100455440 has 20 divisors (see below), whose sum is σ = 4883559084. Its totient is φ = 840182144.

The previous prime is 2100455419. The next prime is 2100455501. The reversal of 2100455440 is 445540012.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1295712016 + 804743424 = 35996^2 + 28368^2 .

It is a tau number, because it is divible by the number of its divisors (20).

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 3 ways as a sum of consecutive naturals, for example, 13127767 + ... + 13127926.

Almost surely, 2^2100455440 is an apocalyptic number.

2100455440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2100455440 is an abundant number, since it is smaller than the sum of its proper divisors (2783103644).

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

2100455440 is a wasteful number, since it uses less digits than its factorization.

2100455440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26255706 (or 26255700 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 25.

The square root of 2100455440 is about 45830.7259379556. The cubic root of 2100455440 is about 1280.6717340061.

Adding to 2100455440 its reverse (445540012), we get a palindrome (2545995452).

The spelling of 2100455440 in words is "two billion, one hundred million, four hundred fifty-five thousand, four hundred forty".