2101001011 has 4 divisors (see below), whose sum is σ = 2108989872. Its totient is φ = 2093012152.

The previous prime is 2101001009. The next prime is 2101001029. The reversal of 2101001011 is 1101001012.

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 2101001011 - 2¹ = 2101001009 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2101000985 and 2101001003.

It is not an unprimeable number, because it can be changed into a prime (2101001041) 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, 3994036 + ... + 3994561.

It is an arithmetic number, because the mean of its divisors is an integer number (527247468).

Almost surely, 2^2101001011 is an apocalyptic number.

2101001011 is a deficient number, since it is larger than the sum of its proper divisors (7988861).

2101001011 is an equidigital number, since it uses as much as digits as its factorization.

2101001011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7988860.

The product of its (nonzero) digits is 2, while the sum is 7.

The square root of 2101001011 is about 45836.6775737509. The cubic root of 2101001011 is about 1280.7826047028.

Adding to 2101001011 its reverse (1101001012), we get a palindrome (3202002023).

Subtracting from 2101001011 its reverse (1101001012), we obtain a palindrome (999999999).

The spelling of 2101001011 in words is "two billion, one hundred one million, one thousand, eleven".