1212131211 has 16 divisors (see below), whose sum is σ = 1732026624. Its totient is φ = 752061024.

The previous prime is 1212131197. The next prime is 1212131213. The reversal of 1212131211 is 1121312121.

It is not a de Polignac number, because 1212131211 - 2⁷ = 1212131083 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1212131213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 234841 + ... + 239946.

It is an arithmetic number, because the mean of its divisors is an integer number (108251664).

Almost surely, 2^1212131211 is an apocalyptic number.

1212131211 is a deficient number, since it is larger than the sum of its proper divisors (519895413).

1212131211 is a wasteful number, since it uses less digits than its factorization.

1212131211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 474850.

The product of its digits is 24, while the sum is 15.

The square root of 1212131211 is about 34815.6747888074. The cubic root of 1212131211 is about 1066.2274960422.

Adding to 1212131211 its reverse (1121312121), we get a palindrome (2333443332).

It can be divided in two parts, 1 and 212131211, that added together give a palindrome (212131212).

The spelling of 1212131211 in words is "one billion, two hundred twelve million, one hundred thirty-one thousand, two hundred eleven".