1001201221101 has 4 divisors (see below), whose sum is σ = 1334934961472. Its totient is φ = 667467480732.

The previous prime is 1001201221051. The next prime is 1001201221121. The reversal of 1001201221101 is 1011221021001.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 1001201221101 - 2¹³ = 1001201212909 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1001201221121) 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, 166866870181 + ... + 166866870186.

It is an arithmetic number, because the mean of its divisors is an integer number (333733740368).

Almost surely, 2^{1001201221101} is an apocalyptic number.

It is an amenable number.

1001201221101 is a deficient number, since it is larger than the sum of its proper divisors (333733740371).

1001201221101 is an equidigital number, since it uses as much as digits as its factorization.

1001201221101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333733740370.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 1001201221101 its reverse (1011221021001), we get a palindrome (2012422242102).

It can be divided in two parts, 1001 and 201221101, that added together give a palindrome (201222102).

The spelling of 1001201221101 in words is "one trillion, one billion, two hundred one million, two hundred twenty-one thousand, one hundred one".