2101311123 has 4 divisors (see below), whose sum is σ = 2801748168. Its totient is φ = 1400874080.

The previous prime is 2101311071. The next prime is 2101311169. The reversal of 2101311123 is 3211131012.

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 2101311123 - 2¹⁴ = 2101294739 is a prime.

It is a super-2 number, since 2×2101311123² = 8831016871287042258, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2101351123) 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, 350218518 + ... + 350218523.

It is an arithmetic number, because the mean of its divisors is an integer number (700437042).

Almost surely, 2^2101311123 is an apocalyptic number.

2101311123 is a deficient number, since it is larger than the sum of its proper divisors (700437045).

2101311123 is an equidigital number, since it uses as much as digits as its factorization.

2101311123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 700437044.

The product of its (nonzero) digits is 36, while the sum is 15.

The square root of 2101311123 is about 45840.0602421070. The cubic root of 2101311123 is about 1280.8456169706.

Adding to 2101311123 its reverse (3211131012), we get a palindrome (5312442135).

The spelling of 2101311123 in words is "two billion, one hundred one million, three hundred eleven thousand, one hundred twenty-three".