2001101001221 has 8 divisors (see below), whose sum is σ = 2289993678720. Its totient is φ = 1712963600208.

The previous prime is 2001101001203. The next prime is 2001101001227. The reversal of 2001101001221 is 1221001011002.

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

It is not a de Polignac number, because 2001101001221 - 2⁶ = 2001101001157 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2001101001227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 188813441 + ... + 188824038.

It is an arithmetic number, because the mean of its divisors is an integer number (286249209840).

Almost surely, 2^{2001101001221} is an apocalyptic number.

It is an amenable number.

2001101001221 is a deficient number, since it is larger than the sum of its proper divisors (288892677499).

2001101001221 is an equidigital number, since it uses as much as digits as its factorization.

2001101001221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 377638243.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 2001101001221 its reverse (1221001011002), we get a palindrome (3222102012223).

The spelling of 2001101001221 in words is "two trillion, one billion, one hundred one million, one thousand, two hundred twenty-one".