2001201021222 has 64 divisors (see below), whose sum is σ = 4538634240000. Its totient is φ = 583153406208.

The previous prime is 2001201021179. The next prime is 2001201021229. The reversal of 2001201021222 is 2221201021002.

It is a super-3 number, since 3×2001201021222³ (a number of 38 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2001201021229) 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 31 ways as a sum of consecutive naturals, for example, 4297179 + ... + 4740057.

It is an arithmetic number, because the mean of its divisors is an integer number (70916160000).

Almost surely, 2^{2001201021222} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2001201021222, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2269317120000).

2001201021222 is an abundant number, since it is smaller than the sum of its proper divisors (2537433218778).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2001201021222 is a wasteful number, since it uses less digits than its factorization.

2001201021222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 445965.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 2001201021222 its reverse (2221201021002), we get a palindrome (4222402042224).

The spelling of 2001201021222 in words is "two trillion, one billion, two hundred one million, twenty-one thousand, two hundred twenty-two".