1002002210021 has 2 divisors, whose sum is σ = 1002002210022. Its totient is φ = 1002002210020.

The previous prime is 1002002210009. The next prime is 1002002210059. The reversal of 1002002210021 is 1200122002001.

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., 628175130625 + 373827079396 = 792575^2 + 611414^2 .

It is a cyclic number.

It is not a de Polignac number, because 1002002210021 - 2¹⁴ = 1002002193637 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1002002209984 and 1002002210011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1002002210621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 501001105010 + 501001105011.

It is an arithmetic number, because the mean of its divisors is an integer number (501001105011).

Almost surely, 2^{1002002210021} is an apocalyptic number.

It is an amenable number.

1002002210021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1002002210021 is an equidigital number, since it uses as much as digits as its factorization.

1002002210021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 1002002210021 its reverse (1200122002001), we get a palindrome (2202124212022).

The spelling of 1002002210021 in words is "one trillion, two billion, two million, two hundred ten thousand, twenty-one".