2101804605 has 80 divisors (see below), whose sum is σ = 4199532480. Its totient is φ = 999433728.

The previous prime is 2101804553. The next prime is 2101804657. The reversal of 2101804605 is 5064081012.

2101804605 is a `hidden beast` number, since 21 + 0 + 180 + 460 + 5 = 666.

It is an interprime number because it is at equal distance from previous prime (2101804553) and next prime (2101804657).

It is not a de Polignac number, because 2101804605 - 2⁶ = 2101804541 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 122782 + ... + 138848.

It is an arithmetic number, because the mean of its divisors is an integer number (52494156).

Almost surely, 2^2101804605 is an apocalyptic number.

It is an amenable number.

2101804605 is a deficient number, since it is larger than the sum of its proper divisors (2097727875).

2101804605 is a wasteful number, since it uses less digits than its factorization.

2101804605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16120 (or 16111 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The square root of 2101804605 is about 45845.4425761165. The cubic root of 2101804605 is about 1280.9458757688.

Adding to 2101804605 its reverse (5064081012), we get a palindrome (7165885617).

The spelling of 2101804605 in words is "two billion, one hundred one million, eight hundred four thousand, six hundred five".