1002021002221 has 2 divisors, whose sum is σ = 1002021002222. Its totient is φ = 1002021002220.

The previous prime is 1002021002219. The next prime is 1002021002243. The reversal of 1002021002221 is 1222001202001.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 997479590121 + 4541412100 = 998739^2 + 67390^2 .

It is a cyclic number.

It is not a de Polignac number, because 1002021002221 - 2¹ = 1002021002219 is a prime.

Together with 1002021002219, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1002021000221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 501010501110 + 501010501111.

It is an arithmetic number, because the mean of its divisors is an integer number (501010501111).

Almost surely, 2^{1002021002221} is an apocalyptic number.

It is an amenable number.

1002021002221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1002021002221 is an equidigital number, since it uses as much as digits as its factorization.

1002021002221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 1002021002221 its reverse (1222001202001), we get a palindrome (2224022204222).

The spelling of 1002021002221 in words is "one trillion, two billion, twenty-one million, two thousand, two hundred twenty-one".