2100405544 has 8 divisors (see below), whose sum is σ = 3938260410. Its totient is φ = 1050202768.

The previous prime is 2100405491. The next prime is 2100405547. The reversal of 2100405544 is 4455040012.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1742060644 + 358344900 = 41738^2 + 18930^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (2100405547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 131275339 + ... + 131275354.

Almost surely, 2^2100405544 is an apocalyptic number.

It is an amenable number.

2100405544 is a deficient number, since it is larger than the sum of its proper divisors (1837854866).

2100405544 is a wasteful number, since it uses less digits than its factorization.

2100405544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 262550699 (or 262550695 counting only the distinct ones).

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

The square root of 2100405544 is about 45830.1815837555. The cubic root of 2100405544 is about 1280.6615932050.

Adding to 2100405544 its reverse (4455040012), we get a palindrome (6555445556).

The spelling of 2100405544 in words is "two billion, one hundred million, four hundred five thousand, five hundred forty-four".