1212212213 has 2 divisors, whose sum is σ = 1212212214. Its totient is φ = 1212212212.

The previous prime is 1212212147. The next prime is 1212212219. The reversal of 1212212213 is 3122122121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1184942929 + 27269284 = 34423^2 + 5222^2 .

It is a cyclic number.

It is not a de Polignac number, because 1212212213 - 2¹² = 1212208117 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1212212191 and 1212212200.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1212212219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606106106 + 606106107.

It is an arithmetic number, because the mean of its divisors is an integer number (606106107).

Almost surely, 2^1212212213 is an apocalyptic number.

It is an amenable number.

1212212213 is a deficient number, since it is larger than the sum of its proper divisors (1).

1212212213 is an equidigital number, since it uses as much as digits as its factorization.

1212212213 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 1212212213 is about 34816.8380672341. The cubic root of 1212212213 is about 1066.2512461211.

Adding to 1212212213 its reverse (3122122121), we get a palindrome (4334334334).

The spelling of 1212212213 in words is "one billion, two hundred twelve million, two hundred twelve thousand, two hundred thirteen".