1221211211959 has 2 divisors, whose sum is σ = 1221211211960. Its totient is φ = 1221211211958.

The previous prime is 1221211211939. The next prime is 1221211212187. The reversal of 1221211211959 is 9591121121221.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1221211211959 - 2⁹ = 1221211211447 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221211211939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610605605979 + 610605605980.

It is an arithmetic number, because the mean of its divisors is an integer number (610605605980).

Almost surely, 2^{1221211211959} is an apocalyptic number.

1221211211959 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221211211959 is an equidigital number, since it uses as much as digits as its factorization.

1221211211959 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6480, while the sum is 37.

The spelling of 1221211211959 in words is "one trillion, two hundred twenty-one billion, two hundred eleven million, two hundred eleven thousand, nine hundred fifty-nine".