2012121211 has 4 divisors (see below), whose sum is σ = 2016603000. Its totient is φ = 2007639424.

The previous prime is 2012121179. The next prime is 2012121229. The reversal of 2012121211 is 1121212102.

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 2012121211 - 2⁵ = 2012121179 is a prime.

It is a super-2 number, since 2×2012121211² = 8097263535512213042, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2012121191 and 2012121200.

It is not an unprimeable number, because it can be changed into a prime (2012121011) 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, 2240221 + ... + 2241118.

It is an arithmetic number, because the mean of its divisors is an integer number (504150750).

Almost surely, 2^2012121211 is an apocalyptic number.

2012121211 is a deficient number, since it is larger than the sum of its proper divisors (4481789).

2012121211 is an equidigital number, since it uses as much as digits as its factorization.

2012121211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4481788.

The product of its (nonzero) digits is 16, while the sum is 13.

The square root of 2012121211 is about 44856.6740965043. The cubic root of 2012121211 is about 1262.4612199440.

Adding to 2012121211 its reverse (1121212102), we get a palindrome (3133333313).

The spelling of 2012121211 in words is "two billion, twelve million, one hundred twenty-one thousand, two hundred eleven".