2011131121 has 4 divisors (see below), whose sum is σ = 2080480500. Its totient is φ = 1941781744.

The previous prime is 2011131079. The next prime is 2011131137. The reversal of 2011131121 is 1211311102.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1022720400 + 988410721 = 31980^2 + 31439^2 .

It is a cyclic number.

It is not a de Polignac number, because 2011131121 - 2¹¹ = 2011129073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2011138121) 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, 34674646 + ... + 34674703.

It is an arithmetic number, because the mean of its divisors is an integer number (520120125).

Almost surely, 2^2011131121 is an apocalyptic number.

It is an amenable number.

2011131121 is a deficient number, since it is larger than the sum of its proper divisors (69349379).

2011131121 is an equidigital number, since it uses as much as digits as its factorization.

2011131121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69349378.

The product of its (nonzero) digits is 12, while the sum is 13.

The square root of 2011131121 is about 44845.6365881899. The cubic root of 2011131121 is about 1262.2541159027.

Adding to 2011131121 its reverse (1211311102), we get a palindrome (3222442223).

The spelling of 2011131121 in words is "two billion, eleven million, one hundred thirty-one thousand, one hundred twenty-one".