2021221021997 has 2 divisors, whose sum is σ = 2021221021998. Its totient is φ = 2021221021996.

The previous prime is 2021221021979. The next prime is 2021221022003. The reversal of 2021221021997 is 7991201221202.

Together with previous prime (2021221021979) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1920499844041 + 100721177956 = 1385821^2 + 317366^2 .

It is a cyclic number.

It is not a de Polignac number, because 2021221021997 - 2¹² = 2021221017901 is a prime.

It is a super-3 number, since 3×2021221021997³ (a number of 38 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2021221021997.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2021221021397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1010610510998 + 1010610510999.

It is an arithmetic number, because the mean of its divisors is an integer number (1010610510999).

Almost surely, 2^{2021221021997} is an apocalyptic number.

It is an amenable number.

2021221021997 is a deficient number, since it is larger than the sum of its proper divisors (1).

2021221021997 is an equidigital number, since it uses as much as digits as its factorization.

2021221021997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18144, while the sum is 38.

The spelling of 2021221021997 in words is "two trillion, twenty-one billion, two hundred twenty-one million, twenty-one thousand, nine hundred ninety-seven".