1211222213 has 2 divisors, whose sum is σ = 1211222214. Its totient is φ = 1211222212.

The previous prime is 1211222191. The next prime is 1211222227. The reversal of 1211222213 is 3122221121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1027971844 + 183250369 = 32062^2 + 13537^2 .

It is a cyclic number.

It is not a de Polignac number, because 1211222213 - 2²⁴ = 1194444997 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1211222191 and 1211222200.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1211222263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605611106 + 605611107.

It is an arithmetic number, because the mean of its divisors is an integer number (605611107).

Almost surely, 2^1211222213 is an apocalyptic number.

It is an amenable number.

1211222213 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211222213 is an equidigital number, since it uses as much as digits as its factorization.

1211222213 is an evil number, because the sum of its binary digits is even.

The product of its digits is 96, while the sum is 17.

The square root of 1211222213 is about 34802.6179044048. The cubic root of 1211222213 is about 1065.9609019566.

Adding to 1211222213 its reverse (3122221121), we get a palindrome (4333443334).

The spelling of 1211222213 in words is "one billion, two hundred eleven million, two hundred twenty-two thousand, two hundred thirteen".