2105221291 has 4 divisors (see below), whose sum is σ = 2116243584. Its totient is φ = 2094199000.

The previous prime is 2105221289. The next prime is 2105221297. The reversal of 2105221291 is 1921225012.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2105221291 - 2¹ = 2105221289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2105221297) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5510860 + ... + 5511241.

It is an arithmetic number, because the mean of its divisors is an integer number (529060896).

Almost surely, 2^2105221291 is an apocalyptic number.

2105221291 is a deficient number, since it is larger than the sum of its proper divisors (11022293).

2105221291 is a wasteful number, since it uses less digits than its factorization.

2105221291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11022292.

The product of its (nonzero) digits is 720, while the sum is 25.

The square root of 2105221291 is about 45882.6905379360. The cubic root of 2105221291 is about 1281.6396003340.

The spelling of 2105221291 in words is "two billion, one hundred five million, two hundred twenty-one thousand, two hundred ninety-one".