1211020222091 has 2 divisors, whose sum is σ = 1211020222092. Its totient is φ = 1211020222090.

The previous prime is 1211020222073. The next prime is 1211020222123. The reversal of 1211020222091 is 1902220201121.

It is a weak prime.

It is an emirp because it is prime and its reverse (1902220201121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1211020222091 - 2³⁴ = 1193840352907 is a prime.

It is not a weakly prime, because it can be changed into another prime (1211020222031) 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, 605510111045 + 605510111046.

It is an arithmetic number, because the mean of its divisors is an integer number (605510111046).

Almost surely, 2^{1211020222091} is an apocalyptic number.

1211020222091 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211020222091 is an equidigital number, since it uses as much as digits as its factorization.

1211020222091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 23.

The spelling of 1211020222091 in words is "one trillion, two hundred eleven billion, twenty million, two hundred twenty-two thousand, ninety-one".