2121662205 has 24 divisors (see below), whose sum is σ = 3960437208. Its totient is φ = 1044510336.

The previous prime is 2121662201. The next prime is 2121662261. The reversal of 2121662205 is 5022661212.

2121662205 is a `hidden beast` number, since 21 + 2 + 16 + 622 + 0 + 5 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 31069476 + 2090592729 = 5574^2 + 45723^2 .

It is not a de Polignac number, because 2121662205 - 2² = 2121662201 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121662201) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1812802 + ... + 1813971.

It is an arithmetic number, because the mean of its divisors is an integer number (165018217).

Almost surely, 2^2121662205 is an apocalyptic number.

It is an amenable number.

2121662205 is a deficient number, since it is larger than the sum of its proper divisors (1838775003).

2121662205 is a wasteful number, since it uses less digits than its factorization.

2121662205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3626797 (or 3626794 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 2121662205 is about 46061.5045889732. The cubic root of 2121662205 is about 1284.9673123249.

The spelling of 2121662205 in words is "two billion, one hundred twenty-one million, six hundred sixty-two thousand, two hundred five".