1001112120221 has 4 divisors (see below), whose sum is σ = 1012360571100. Its totient is φ = 989863669344.

The previous prime is 1001112120187. The next prime is 1001112120223. The reversal of 1001112120221 is 1220212111001.

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

It can be written as a sum of positive squares in 2 ways, for example, as 405304123225 + 595807996996 = 636635^2 + 771886^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1001112120221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1001112120196 and 1001112120205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1001112120223) 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, 5624225306 + ... + 5624225483.

It is an arithmetic number, because the mean of its divisors is an integer number (253090142775).

Almost surely, 2^{1001112120221} is an apocalyptic number.

It is an amenable number.

1001112120221 is a deficient number, since it is larger than the sum of its proper divisors (11248450879).

1001112120221 is an equidigital number, since it uses as much as digits as its factorization.

1001112120221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11248450878.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 1001112120221 its reverse (1220212111001), we get a palindrome (2221324231222).

The spelling of 1001112120221 in words is "one trillion, one billion, one hundred twelve million, one hundred twenty thousand, two hundred twenty-one".