1001002110221 has 2 divisors, whose sum is σ = 1001002110222. Its totient is φ = 1001002110220.

The previous prime is 1001002110209. The next prime is 1001002110223. The reversal of 1001002110221 is 1220112001001.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 979397226025 + 21604884196 = 989645^2 + 146986^2 .

It is an emirp because it is prime and its reverse (1220112001001) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1001002110221 - 2²² = 1000997915917 is a prime.

Together with 1001002110223, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1001002110223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 500501055110 + 500501055111.

It is an arithmetic number, because the mean of its divisors is an integer number (500501055111).

Almost surely, 2^{1001002110221} is an apocalyptic number.

It is an amenable number.

1001002110221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1001002110221 is an equidigital number, since it uses as much as digits as its factorization.

1001002110221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 1001002110221 its reverse (1220112001001), we get a palindrome (2221114111222).

The spelling of 1001002110221 in words is "one trillion, one billion, two million, one hundred ten thousand, two hundred twenty-one".