2001121221201 has 16 divisors (see below), whose sum is σ = 2790628485120. Its totient is φ = 1273116545360.

The previous prime is 2001121221193. The next prime is 2001121221259. The reversal of 2001121221201 is 1021221211002.

It is a cyclic number.

It is not a de Polignac number, because 2001121221201 - 2³ = 2001121221193 is a prime.

It is a super-2 number, since 2×2001121221201² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2001121223201) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33614991 + ... + 33674468.

It is an arithmetic number, because the mean of its divisors is an integer number (174414280320).

Almost surely, 2^{2001121221201} is an apocalyptic number.

It is an amenable number.

2001121221201 is a deficient number, since it is larger than the sum of its proper divisors (789507263919).

2001121221201 is a wasteful number, since it uses less digits than its factorization.

2001121221201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67289916.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 2001121221201 its reverse (1021221211002), we get a palindrome (3022342432203).

The spelling of 2001121221201 in words is "two trillion, one billion, one hundred twenty-one million, two hundred twenty-one thousand, two hundred one".