1001221022221 has 8 divisors (see below), whose sum is σ = 1144617382080. Its totient is φ = 857915858688.

The previous prime is 1001221022213. The next prime is 1001221022231. The reversal of 1001221022221 is 1222201221001.

It is a happy number.

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

It is not a de Polignac number, because 1001221022221 - 2³ = 1001221022213 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1001221022195 and 1001221022204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1001221022231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22775551 + ... + 22819468.

It is an arithmetic number, because the mean of its divisors is an integer number (143077172760).

Almost surely, 2^{1001221022221} is an apocalyptic number.

It is an amenable number.

1001221022221 is a deficient number, since it is larger than the sum of its proper divisors (143396359859).

1001221022221 is an equidigital number, since it uses as much as digits as its factorization.

1001221022221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45598163.

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

Adding to 1001221022221 its reverse (1222201221001), we get a palindrome (2223422243222).

The spelling of 1001221022221 in words is "one trillion, one billion, two hundred twenty-one million, twenty-two thousand, two hundred twenty-one".