1001202221221 has 8 divisors (see below), whose sum is σ = 1006645939488. Its totient is φ = 995770050000.

The previous prime is 1001202221213. The next prime is 1001202221249. The reversal of 1001202221221 is 1221222021001.

It is a happy number.

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 1001202221221 - 2³ = 1001202221213 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1001202221195 and 1001202221204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1001202221291) 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 7 ways as a sum of consecutive naturals, for example, 2712850 + ... + 3059731.

It is an arithmetic number, because the mean of its divisors is an integer number (125830742436).

Almost surely, 2^{1001202221221} is an apocalyptic number.

It is an amenable number.

1001202221221 is a deficient number, since it is larger than the sum of its proper divisors (5443718267).

1001202221221 is an equidigital number, since it uses as much as digits as its factorization.

1001202221221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5773523.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 1001202221221 its reverse (1221222021001), we get a palindrome (2222424242222).

The spelling of 1001202221221 in words is "one trillion, one billion, two hundred two million, two hundred twenty-one thousand, two hundred twenty-one".