1200021309791 has 2 divisors, whose sum is σ = 1200021309792. Its totient is φ = 1200021309790.

The previous prime is 1200021309763. The next prime is 1200021309847. The reversal of 1200021309791 is 1979031200021.

It is a weak prime.

It is an emirp because it is prime and its reverse (1979031200021) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1200021309791 is a prime.

It is a super-2 number, since 2×1200021309791² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1200021309701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 600010654895 + 600010654896.

It is an arithmetic number, because the mean of its divisors is an integer number (600010654896).

Almost surely, 2^{1200021309791} is an apocalyptic number.

1200021309791 is a deficient number, since it is larger than the sum of its proper divisors (1).

1200021309791 is an equidigital number, since it uses as much as digits as its factorization.

1200021309791 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6804, while the sum is 35.

The spelling of 1200021309791 in words is "one trillion, two hundred billion, twenty-one million, three hundred nine thousand, seven hundred ninety-one".