1212311121 has 32 divisors (see below), whose sum is σ = 1868928768. Its totient is φ = 684687360.

The previous prime is 1212311119. The next prime is 1212311137. The reversal of 1212311121 is 1211132121.

It is not a de Polignac number, because 1212311121 - 2¹ = 1212311119 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1212311121.

It is not an unprimeable number, because it can be changed into a prime (1212311101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1520695 + ... + 1521491.

It is an arithmetic number, because the mean of its divisors is an integer number (58404024).

Almost surely, 2^1212311121 is an apocalyptic number.

It is an amenable number.

1212311121 is a deficient number, since it is larger than the sum of its proper divisors (656617647).

1212311121 is a wasteful number, since it uses less digits than its factorization.

1212311121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1561.

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

The square root of 1212311121 is about 34818.2584429492. The cubic root of 1212311121 is about 1066.2802448693.

Adding to 1212311121 its reverse (1211132121), we get a palindrome (2423443242).

The spelling of 1212311121 in words is "one billion, two hundred twelve million, three hundred eleven thousand, one hundred twenty-one".