1221331012079 has 2 divisors, whose sum is σ = 1221331012080. Its totient is φ = 1221331012078.

The previous prime is 1221331012067. The next prime is 1221331012127. The reversal of 1221331012079 is 9702101331221.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1221331012079 - 2⁴ = 1221331012063 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221331012049) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610665506039 + 610665506040.

It is an arithmetic number, because the mean of its divisors is an integer number (610665506040).

Almost surely, 2^{1221331012079} is an apocalyptic number.

1221331012079 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221331012079 is an equidigital number, since it uses as much as digits as its factorization.

1221331012079 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4536, while the sum is 32.

The spelling of 1221331012079 in words is "one trillion, two hundred twenty-one billion, three hundred thirty-one million, twelve thousand, seventy-nine".