1212211110091 has 2 divisors, whose sum is σ = 1212211110092. Its totient is φ = 1212211110090.

The previous prime is 1212211110059. The next prime is 1212211110101. The reversal of 1212211110091 is 1900111122121.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1212211110091 - 2⁵ = 1212211110059 is a prime.

It is not a weakly prime, because it can be changed into another prime (1212211110001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606105555045 + 606105555046.

It is an arithmetic number, because the mean of its divisors is an integer number (606105555046).

Almost surely, 2^{1212211110091} is an apocalyptic number.

1212211110091 is a deficient number, since it is larger than the sum of its proper divisors (1).

1212211110091 is an equidigital number, since it uses as much as digits as its factorization.

1212211110091 is an evil number, because the sum of its binary digits is even.

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

The spelling of 1212211110091 in words is "one trillion, two hundred twelve billion, two hundred eleven million, one hundred ten thousand, ninety-one".