1200022120091 has 4 divisors (see below), whose sum is σ = 1200606643392. Its totient is φ = 1199437596792.

The previous prime is 1200022120061. The next prime is 1200022120127. The reversal of 1200022120091 is 1900212200021.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1200022120091 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1200022120001) 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, 292258571 + ... + 292262676.

It is an arithmetic number, because the mean of its divisors is an integer number (300151660848).

Almost surely, 2^{1200022120091} is an apocalyptic number.

1200022120091 is a deficient number, since it is larger than the sum of its proper divisors (584523301).

1200022120091 is an equidigital number, since it uses as much as digits as its factorization.

1200022120091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 584523300.

The product of its (nonzero) digits is 144, while the sum is 20.

The spelling of 1200022120091 in words is "one trillion, two hundred billion, twenty-two million, one hundred twenty thousand, ninety-one".