1200202100891 has 2 divisors, whose sum is σ = 1200202100892. Its totient is φ = 1200202100890.

The previous prime is 1200202100873. The next prime is 1200202101011. The reversal of 1200202100891 is 1980012020021.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1200202100891 - 2⁶ = 1200202100827 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1200202100891.

It is not a weakly prime, because it can be changed into another prime (1200202100491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 600101050445 + 600101050446.

It is an arithmetic number, because the mean of its divisors is an integer number (600101050446).

Almost surely, 2^{1200202100891} is an apocalyptic number.

1200202100891 is a deficient number, since it is larger than the sum of its proper divisors (1).

1200202100891 is an equidigital number, since it uses as much as digits as its factorization.

1200202100891 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 26.

The spelling of 1200202100891 in words is "one trillion, two hundred billion, two hundred two million, one hundred thousand, eight hundred ninety-one".