20121212211 has 16 divisors (see below), whose sum is σ = 28427331840. Its totient is φ = 12623968800.

The previous prime is 20121212207. The next prime is 20121212213. The reversal of 20121212211 is 11221212102.

It is not a de Polignac number, because 20121212211 - 2² = 20121212207 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20121212213) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1160280 + ... + 1177493.

It is an arithmetic number, because the mean of its divisors is an integer number (1776708240).

Almost surely, 2^20121212211 is an apocalyptic number.

20121212211 is a deficient number, since it is larger than the sum of its proper divisors (8306119629).

20121212211 is a wasteful number, since it uses less digits than its factorization.

20121212211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2337946.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 20121212211 its reverse (11221212102), we get a palindrome (31342424313).

The spelling of 20121212211 in words is "twenty billion, one hundred twenty-one million, two hundred twelve thousand, two hundred eleven".