2111020291 has 4 divisors (see below), whose sum is σ = 2131921584. Its totient is φ = 2090119000.

The previous prime is 2111020277. The next prime is 2111020337. The reversal of 2111020291 is 1920201112.

It is a happy number.

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 2111020291 - 2¹¹ = 2111018243 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2111020231) 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, 10450495 + ... + 10450696.

It is an arithmetic number, because the mean of its divisors is an integer number (532980396).

Almost surely, 2^2111020291 is an apocalyptic number.

2111020291 is a deficient number, since it is larger than the sum of its proper divisors (20901293).

2111020291 is a wasteful number, since it uses less digits than its factorization.

2111020291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20901292.

The product of its (nonzero) digits is 72, while the sum is 19.

The square root of 2111020291 is about 45945.8408454998. The cubic root of 2111020291 is about 1282.8153143039.

The spelling of 2111020291 in words is "two billion, one hundred eleven million, twenty thousand, two hundred ninety-one".