1212020111091 has 4 divisors (see below), whose sum is σ = 1616026814792. Its totient is φ = 808013407392.

The previous prime is 1212020111069. The next prime is 1212020111119. The reversal of 1212020111091 is 1901110202121.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1212020111091 - 2⁷ = 1212020110963 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1212020111891) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 202003351846 + ... + 202003351851.

It is an arithmetic number, because the mean of its divisors is an integer number (404006703698).

Almost surely, 2^{1212020111091} is an apocalyptic number.

1212020111091 is a deficient number, since it is larger than the sum of its proper divisors (404006703701).

1212020111091 is an equidigital number, since it uses as much as digits as its factorization.

1212020111091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 404006703700.

The product of its (nonzero) digits is 72, while the sum is 21.

The spelling of 1212020111091 in words is "one trillion, two hundred twelve billion, twenty million, one hundred eleven thousand, ninety-one".