1001201220091 has 8 divisors (see below), whose sum is σ = 1001849191200. Its totient is φ = 1000553390592.

The previous prime is 1001201220059. The next prime is 1001201220133. The reversal of 1001201220091 is 1900221021001.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1001201220091 - 2⁵ = 1001201220059 is a prime.

It is a super-2 number, since 2×1001201220091² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1001201220001) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16561666 + ... + 16622008.

It is an arithmetic number, because the mean of its divisors is an integer number (125231148900).

Almost surely, 2^{1001201220091} is an apocalyptic number.

1001201220091 is a deficient number, since it is larger than the sum of its proper divisors (647971109).

1001201220091 is an equidigital number, since it uses as much as digits as its factorization.

1001201220091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70805.

The product of its (nonzero) digits is 72, while the sum is 19.

Adding to 1001201220091 its reverse (1900221021001), we get a palindrome (2901422241092).

The spelling of 1001201220091 in words is "one trillion, one billion, two hundred one million, two hundred twenty thousand, ninety-one".