2221099999897 has 2 divisors, whose sum is σ = 2221099999898. Its totient is φ = 2221099999896.

The previous prime is 2221099999813. The next prime is 2221100000029. The reversal of 2221099999897 is 7989999901222.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2213322700176 + 7777299721 = 1487724^2 + 88189^2 .

It is a cyclic number.

It is not a de Polignac number, because 2221099999897 - 2³⁹ = 1671344186009 is a prime.

It is not a weakly prime, because it can be changed into another prime (2221099996897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1110549999948 + 1110549999949.

It is an arithmetic number, because the mean of its divisors is an integer number (1110549999949).

Almost surely, 2^{2221099999897} is an apocalyptic number.

It is an amenable number.

2221099999897 is a deficient number, since it is larger than the sum of its proper divisors (1).

2221099999897 is an equidigital number, since it uses as much as digits as its factorization.

2221099999897 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 238085568, while the sum is 76.

The spelling of 2221099999897 in words is "two trillion, two hundred twenty-one billion, ninety-nine million, nine hundred ninety-nine thousand, eight hundred ninety-seven".