1212120100091 has 16 divisors (see below), whose sum is σ = 1301716728576. Its totient is φ = 1125909841056.

The previous prime is 1212120100057. The next prime is 1212120100123. The reversal of 1212120100091 is 1900010212121.

It is not a de Polignac number, because 1212120100091 - 2²² = 1212115905787 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1212120100291) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3371105 + ... + 3713298.

It is an arithmetic number, because the mean of its divisors is an integer number (81357295536).

Almost surely, 2^{1212120100091} is an apocalyptic number.

1212120100091 is a deficient number, since it is larger than the sum of its proper divisors (89596628485).

1212120100091 is a wasteful number, since it uses less digits than its factorization.

1212120100091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7084642.

The product of its (nonzero) digits is 72, while the sum is 20.

The spelling of 1212120100091 in words is "one trillion, two hundred twelve billion, one hundred twenty million, one hundred thousand, ninety-one".