2001122111221 has 8 divisors (see below), whose sum is σ = 2035098149760. Its totient is φ = 1967148029952.

The previous prime is 2001122111213. The next prime is 2001122111249. The reversal of 2001122111221 is 1221112211002.

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

It is a cyclic number.

It is not a de Polignac number, because 2001122111221 - 2³ = 2001122111213 is a prime.

It is a super-2 number, since 2×2001122111221² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2001122111195 and 2001122111204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2001122111321) 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 7 ways as a sum of consecutive naturals, for example, 1651701 + ... + 2594293.

It is an arithmetic number, because the mean of its divisors is an integer number (254387268720).

Almost surely, 2^{2001122111221} is an apocalyptic number.

It is an amenable number.

2001122111221 is a deficient number, since it is larger than the sum of its proper divisors (33976038539).

2001122111221 is an equidigital number, since it uses as much as digits as its factorization.

2001122111221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 978635.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 2001122111221 its reverse (1221112211002), we get a palindrome (3222234322223).

The spelling of 2001122111221 in words is "two trillion, one billion, one hundred twenty-two million, one hundred eleven thousand, two hundred twenty-one".