1212121307 has 2 divisors, whose sum is σ = 1212121308. Its totient is φ = 1212121306.

The previous prime is 1212121291. The next prime is 1212121331. The reversal of 1212121307 is 7031212121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1212121307 - 2⁴ = 1212121291 is a prime.

It is not a weakly prime, because it can be changed into another prime (1212121357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606060653 + 606060654.

It is an arithmetic number, because the mean of its divisors is an integer number (606060654).

Almost surely, 2^1212121307 is an apocalyptic number.

1212121307 is a deficient number, since it is larger than the sum of its proper divisors (1).

1212121307 is an equidigital number, since it uses as much as digits as its factorization.

1212121307 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 168, while the sum is 20.

The square root of 1212121307 is about 34815.5325537324. The cubic root of 1212121307 is about 1066.2245920810.

Adding to 1212121307 its reverse (7031212121), we get a palindrome (8243333428).

The spelling of 1212121307 in words is "one billion, two hundred twelve million, one hundred twenty-one thousand, three hundred seven".