2011121331 has 4 divisors (see below), whose sum is σ = 2681495112. Its totient is φ = 1340747552.

The previous prime is 2011121323. The next prime is 2011121351. The reversal of 2011121331 is 1331211102.

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 2011121331 - 2³ = 2011121323 is a prime.

It is a super-2 number, since 2×2011121331² = 8089218016006423122, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2011121331.

It is not an unprimeable number, because it can be changed into a prime (2011121351) 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, 335186886 + ... + 335186891.

It is an arithmetic number, because the mean of its divisors is an integer number (670373778).

Almost surely, 2^2011121331 is an apocalyptic number.

2011121331 is a deficient number, since it is larger than the sum of its proper divisors (670373781).

2011121331 is an equidigital number, since it uses as much as digits as its factorization.

2011121331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 670373780.

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

The square root of 2011121331 is about 44845.5274358547. The cubic root of 2011121331 is about 1262.2520677206.

Adding to 2011121331 its reverse (1331211102), we get a palindrome (3342332433).

The spelling of 2011121331 in words is "two billion, eleven million, one hundred twenty-one thousand, three hundred thirty-one".