212120131121 has 2 divisors, whose sum is σ = 212120131122. Its totient is φ = 212120131120.

The previous prime is 212120131117. The next prime is 212120131247. The reversal of 212120131121 is 121131021212.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 212078670400 + 41460721 = 460520^2 + 6439^2 .

It is a cyclic number.

It is not a de Polignac number, because 212120131121 - 2² = 212120131117 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 212120131121.

It is not a weakly prime, because it can be changed into another prime (212120131921) 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 as a sum of consecutive naturals, namely, 106060065560 + 106060065561.

It is an arithmetic number, because the mean of its divisors is an integer number (106060065561).

Almost surely, 2^212120131121 is an apocalyptic number.

It is an amenable number.

212120131121 is a deficient number, since it is larger than the sum of its proper divisors (1).

212120131121 is an equidigital number, since it uses as much as digits as its factorization.

212120131121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 212120131121 its reverse (121131021212), we get a palindrome (333251152333).

The spelling of 212120131121 in words is "two hundred twelve billion, one hundred twenty million, one hundred thirty-one thousand, one hundred twenty-one".