20121211 has 12 divisors (see below), whose sum is σ = 22264200. Its totient is φ = 18170240.

The previous prime is 20121193. The next prime is 20121271. The reversal of 20121211 is 11212102.

It is not a de Polignac number, because 20121211 - 2¹¹ = 20119163 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20121271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21195 + ... + 22123.

It is an arithmetic number, because the mean of its divisors is an integer number (1855350).

Almost surely, 2^20121211 is an apocalyptic number.

20121211 is a deficient number, since it is larger than the sum of its proper divisors (2142989).

20121211 is a wasteful number, since it uses less digits than its factorization.

20121211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1130 (or 1119 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

The square root of 20121211 is about 4485.6672859230. The cubic root of 20121211 is about 271.9890197052.

Adding to 20121211 its reverse (11212102), we get a palindrome (31333313).

It can be divided in two parts, 2012 and 1211, that added together give a palindrome (3223).

The spelling of 20121211 in words is "twenty million, one hundred twenty-one thousand, two hundred eleven".