1212020020091 has 2 divisors, whose sum is σ = 1212020020092. Its totient is φ = 1212020020090.

The previous prime is 1212020020073. The next prime is 1212020020147. The reversal of 1212020020091 is 1900200202121.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1212020020091 - 2⁶ = 1212020020027 is a prime.

It is not a weakly prime, because it can be changed into another prime (1212020020051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606010010045 + 606010010046.

It is an arithmetic number, because the mean of its divisors is an integer number (606010010046).

Almost surely, 2^{1212020020091} is an apocalyptic number.

1212020020091 is a deficient number, since it is larger than the sum of its proper divisors (1).

1212020020091 is an equidigital number, since it uses as much as digits as its factorization.

1212020020091 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 20.

The spelling of 1212020020091 in words is "one trillion, two hundred twelve billion, twenty million, twenty thousand, ninety-one".