1232211309991 has 2 divisors, whose sum is σ = 1232211309992. Its totient is φ = 1232211309990.

The previous prime is 1232211309919. The next prime is 1232211310019. The reversal of 1232211309991 is 1999031122321.

Together with previous prime (1232211309919) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1232211309991 - 2¹⁹ = 1232210785703 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1232211309191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 616105654995 + 616105654996.

It is an arithmetic number, because the mean of its divisors is an integer number (616105654996).

Almost surely, 2^{1232211309991} is an apocalyptic number.

1232211309991 is a deficient number, since it is larger than the sum of its proper divisors (1).

1232211309991 is an equidigital number, since it uses as much as digits as its factorization.

1232211309991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 52488, while the sum is 43.

The spelling of 1232211309991 in words is "one trillion, two hundred thirty-two billion, two hundred eleven million, three hundred nine thousand, nine hundred ninety-one".