1002021021997 has 2 divisors, whose sum is σ = 1002021021998. Its totient is φ = 1002021021996.

The previous prime is 1002021021929. The next prime is 1002021022099. The reversal of 1002021021997 is 7991201202001.

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., 782073153801 + 219947868196 = 884349^2 + 468986^2 .

It is a cyclic number.

It is not a de Polignac number, because 1002021021997 - 2²³ = 1002012633389 is a prime.

It is a super-2 number, since 2×1002021021997² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1002021021497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 501010510998 + 501010510999.

It is an arithmetic number, because the mean of its divisors is an integer number (501010510999).

Almost surely, 2^{1002021021997} is an apocalyptic number.

It is an amenable number.

1002021021997 is a deficient number, since it is larger than the sum of its proper divisors (1).

1002021021997 is an equidigital number, since it uses as much as digits as its factorization.

1002021021997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4536, while the sum is 34.

Adding to 1002021021997 its reverse (7991201202001), we get a palindrome (8993222223998).

The spelling of 1002021021997 in words is "one trillion, two billion, twenty-one million, twenty-one thousand, nine hundred ninety-seven".