1211022012191 has 2 divisors, whose sum is σ = 1211022012192. Its totient is φ = 1211022012190.

The previous prime is 1211022012181. The next prime is 1211022012247. The reversal of 1211022012191 is 1912102201121.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1211022012191 - 2²² = 1211017817887 is a prime.

It is a super-2 number, since 2×1211022012191² (a number of 25 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1211022012181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605511006095 + 605511006096.

It is an arithmetic number, because the mean of its divisors is an integer number (605511006096).

Almost surely, 2^{1211022012191} is an apocalyptic number.

1211022012191 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211022012191 is an equidigital number, since it uses as much as digits as its factorization.

1211022012191 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 23.

The spelling of 1211022012191 in words is "one trillion, two hundred eleven billion, twenty-two million, twelve thousand, one hundred ninety-one".