2201021221221 has 48 divisors (see below), whose sum is σ = 3270424248000. Its totient is φ = 1425398252544.

The previous prime is 2201021221199. The next prime is 2201021221277. The reversal of 2201021221221 is 1221221201022.

It is a happy number.

2201021221221 is a `hidden beast` number, since 2 + 201 + 0 + 21 + 221 + 221 = 666.

It is not a de Polignac number, because 2201021221221 - 2⁷ = 2201021221093 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2201021221194 and 2201021221203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2201021222221) 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 47 ways as a sum of consecutive naturals, for example, 1048603630 + ... + 1048605728.

It is an arithmetic number, because the mean of its divisors is an integer number (68133838500).

Almost surely, 2^{2201021221221} is an apocalyptic number.

It is an amenable number.

2201021221221 is a deficient number, since it is larger than the sum of its proper divisors (1069403026779).

2201021221221 is a wasteful number, since it uses less digits than its factorization.

2201021221221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5698 (or 5695 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 2201021221221 its reverse (1221221201022), we get a palindrome (3422242422243).

It can be divided in two parts, 2201021 and 221221, that added together give a palindrome (2422242).

The spelling of 2201021221221 in words is "two trillion, two hundred one billion, twenty-one million, two hundred twenty-one thousand, two hundred twenty-one".