1201221212291 has 2 divisors, whose sum is σ = 1201221212292. Its totient is φ = 1201221212290.

The previous prime is 1201221212249. The next prime is 1201221212293. The reversal of 1201221212291 is 1922121221021.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1201221212291 - 2³⁸ = 926343305347 is a prime.

Together with 1201221212293, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1201221212291.

It is not a weakly prime, because it can be changed into another prime (1201221212293) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 600610606145 + 600610606146.

It is an arithmetic number, because the mean of its divisors is an integer number (600610606146).

Almost surely, 2^{1201221212291} is an apocalyptic number.

1201221212291 is a deficient number, since it is larger than the sum of its proper divisors (1).

1201221212291 is an equidigital number, since it uses as much as digits as its factorization.

1201221212291 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 1201221212291 in words is "one trillion, two hundred one billion, two hundred twenty-one million, two hundred twelve thousand, two hundred ninety-one".