2001220122101 has 4 divisors (see below), whose sum is σ = 2001225153600. Its totient is φ = 2001215090604.

The previous prime is 2001220122059. The next prime is 2001220122107. The reversal of 2001220122101 is 1012210221002.

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 a cyclic number.

It is not a de Polignac number, because 2001220122101 - 2²² = 2001215927797 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 (2001220122107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1862621 + ... + 2733458.

It is an arithmetic number, because the mean of its divisors is an integer number (500306288400).

Almost surely, 2^{2001220122101} is an apocalyptic number.

It is an amenable number.

2001220122101 is a deficient number, since it is larger than the sum of its proper divisors (5031499).

2001220122101 is an equidigital number, since it uses as much as digits as its factorization.

2001220122101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5031498.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 2001220122101 its reverse (1012210221002), we get a palindrome (3013430343103).

The spelling of 2001220122101 in words is "two trillion, one billion, two hundred twenty million, one hundred twenty-two thousand, one hundred one".