1200211212091 has 2 divisors, whose sum is σ = 1200211212092. Its totient is φ = 1200211212090.

The previous prime is 1200211212089. The next prime is 1200211212133. The reversal of 1200211212091 is 1902121120021.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1200211212091 - 2¹ = 1200211212089 is a prime.

Together with 1200211212089, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1200211212001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 600105606045 + 600105606046.

It is an arithmetic number, because the mean of its divisors is an integer number (600105606046).

Almost surely, 2^{1200211212091} is an apocalyptic number.

1200211212091 is a deficient number, since it is larger than the sum of its proper divisors (1).

1200211212091 is an equidigital number, since it uses as much as digits as its factorization.

1200211212091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 22.

The spelling of 1200211212091 in words is "one trillion, two hundred billion, two hundred eleven million, two hundred twelve thousand, ninety-one".