1001001112021 has 4 divisors (see below), whose sum is σ = 1011320711212. Its totient is φ = 990681512832.

The previous prime is 1001001112019. The next prime is 1001001112051. The reversal of 1001001112021 is 1202111001001.

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 354633351121 + 646367760900 = 595511^2 + 803970^2 .

It is a cyclic number.

It is not a de Polignac number, because 1001001112021 - 2¹ = 1001001112019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1001001111989 and 1001001112007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1001001112051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5159799450 + ... + 5159799643.

It is an arithmetic number, because the mean of its divisors is an integer number (252830177803).

Almost surely, 2^{1001001112021} is an apocalyptic number.

It is an amenable number.

1001001112021 is a deficient number, since it is larger than the sum of its proper divisors (10319599191).

1001001112021 is an equidigital number, since it uses as much as digits as its factorization.

1001001112021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10319599190.

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 1001001112021 its reverse (1202111001001), we get a palindrome (2203112113022).

It can be divided in two parts, 100100 and 1112021, that added together give a palindrome (1212121).

The spelling of 1001001112021 in words is "one trillion, one billion, one million, one hundred twelve thousand, twenty-one".