1011211202191 has 2 divisors, whose sum is σ = 1011211202192. Its totient is φ = 1011211202190.

The previous prime is 1011211202179. The next prime is 1011211202257. The reversal of 1011211202191 is 1912021121101.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1011211202191 - 2⁷ = 1011211202063 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1011211202101) 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, 505605601095 + 505605601096.

It is an arithmetic number, because the mean of its divisors is an integer number (505605601096).

Almost surely, 2^{1011211202191} is an apocalyptic number.

1011211202191 is a deficient number, since it is larger than the sum of its proper divisors (1).

1011211202191 is an equidigital number, since it uses as much as digits as its factorization.

1011211202191 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 22.

Adding to 1011211202191 its reverse (1912021121101), we get a palindrome (2923232323292).

The spelling of 1011211202191 in words is "one trillion, eleven billion, two hundred eleven million, two hundred two thousand, one hundred ninety-one".