2221002001997 has 2 divisors, whose sum is σ = 2221002001998. Its totient is φ = 2221002001996.

The previous prime is 2221002001993. The next prime is 2221002002027. The reversal of 2221002001997 is 7991002001222.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1439853603721 + 781148398276 = 1199939^2 + 883826^2 .

It is a cyclic number.

It is not a de Polignac number, because 2221002001997 - 2² = 2221002001993 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2221002001993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1110501000998 + 1110501000999.

It is an arithmetic number, because the mean of its divisors is an integer number (1110501000999).

Almost surely, 2^{2221002001997} is an apocalyptic number.

It is an amenable number.

2221002001997 is a deficient number, since it is larger than the sum of its proper divisors (1).

2221002001997 is an equidigital number, since it uses as much as digits as its factorization.

2221002001997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9072, while the sum is 35.

The spelling of 2221002001997 in words is "two trillion, two hundred twenty-one billion, two million, one thousand, nine hundred ninety-seven".