121001213 has 2 divisors, whose sum is σ = 121001214. Its totient is φ = 121001212.

The previous prime is 121001203. The next prime is 121001239. The reversal of 121001213 is 312100121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 95981209 + 25020004 = 9797^2 + 5002^2 .

It is a cyclic number.

It is not a de Polignac number, because 121001213 - 2⁴ = 121001197 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 121001194 and 121001203.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121001203) 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, 60500606 + 60500607.

It is an arithmetic number, because the mean of its divisors is an integer number (60500607).

Almost surely, 2^121001213 is an apocalyptic number.

It is an amenable number.

121001213 is a deficient number, since it is larger than the sum of its proper divisors (1).

121001213 is an equidigital number, since it uses as much as digits as its factorization.

121001213 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12, while the sum is 11.

The square root of 121001213 is about 11000.0551362255. The cubic root of 121001213 is about 494.6103971028.

Adding to 121001213 its reverse (312100121), we get a palindrome (433101334).

It can be divided in two parts, 12100121 and 3, that multiplied together give a palindrome (36300363).

The spelling of 121001213 in words is "one hundred twenty-one million, one thousand, two hundred thirteen".