121220213 has 2 divisors, whose sum is σ = 121220214. Its totient is φ = 121220212.

The previous prime is 121220201. The next prime is 121220243. The reversal of 121220213 is 312022121.

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., 82755409 + 38464804 = 9097^2 + 6202^2 .

It is an emirp because it is prime and its reverse (312022121) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121220213 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121220243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60610106 + 60610107.

It is an arithmetic number, because the mean of its divisors is an integer number (60610107).

Almost surely, 2^121220213 is an apocalyptic number.

It is an amenable number.

121220213 is a deficient number, since it is larger than the sum of its proper divisors (1).

121220213 is an equidigital number, since it uses as much as digits as its factorization.

121220213 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 121220213 is about 11010.0051316973. The cubic root of 121220213 is about 494.9086155826.

Adding to 121220213 its reverse (312022121), we get a palindrome (433242334).

The spelling of 121220213 in words is "one hundred twenty-one million, two hundred twenty thousand, two hundred thirteen".