2101851311 has 4 divisors (see below), whose sum is σ = 2402115792. Its totient is φ = 1801586832.

The previous prime is 2101851289. The next prime is 2101851313. The reversal of 2101851311 is 1131581012.

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 2101851311 - 2¹⁰ = 2101850287 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2101851313) 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, 150132230 + ... + 150132243.

It is an arithmetic number, because the mean of its divisors is an integer number (600528948).

Almost surely, 2^2101851311 is an apocalyptic number.

2101851311 is a deficient number, since it is larger than the sum of its proper divisors (300264481).

2101851311 is an equidigital number, since it uses as much as digits as its factorization.

2101851311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 300264480.

The product of its (nonzero) digits is 240, while the sum is 23.

The square root of 2101851311 is about 45845.9519587062. The cubic root of 2101851311 is about 1280.9553640303.

The spelling of 2101851311 in words is "two billion, one hundred one million, eight hundred fifty-one thousand, three hundred eleven".