2011121213 has 4 divisors (see below), whose sum is σ = 2014230240. Its totient is φ = 2008012188.

The previous prime is 2011121201. The next prime is 2011121269. The reversal of 2011121213 is 3121211102.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 3121211102 = 2 ⋅1560605551.

It is a cyclic number.

It is not a de Polignac number, because 2011121213 - 2¹⁶ = 2011055677 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 (2011121113) 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, 1553543 + ... + 1554836.

It is an arithmetic number, because the mean of its divisors is an integer number (503557560).

Almost surely, 2^2011121213 is an apocalyptic number.

It is an amenable number.

2011121213 is a deficient number, since it is larger than the sum of its proper divisors (3109027).

2011121213 is an equidigital number, since it uses as much as digits as its factorization.

2011121213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3109026.

The product of its (nonzero) digits is 24, while the sum is 14.

The square root of 2011121213 is about 44845.5261202274. The cubic root of 2011121213 is about 1262.2520430336.

Adding to 2011121213 its reverse (3121211102), we get a palindrome (5132332315).

The spelling of 2011121213 in words is "two billion, eleven million, one hundred twenty-one thousand, two hundred thirteen".