1212202120091 has 2 divisors, whose sum is σ = 1212202120092. Its totient is φ = 1212202120090.

The previous prime is 1212202120079. The next prime is 1212202120121. The reversal of 1212202120091 is 1900212022121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1212202120091 - 2¹⁸ = 1212201857947 is a prime.

It is not a weakly prime, because it can be changed into another prime (1212202120021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606101060045 + 606101060046.

It is an arithmetic number, because the mean of its divisors is an integer number (606101060046).

Almost surely, 2^{1212202120091} is an apocalyptic number.

1212202120091 is a deficient number, since it is larger than the sum of its proper divisors (1).

1212202120091 is an equidigital number, since it uses as much as digits as its factorization.

1212202120091 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 1212202120091 in words is "one trillion, two hundred twelve billion, two hundred two million, one hundred twenty thousand, ninety-one".