221000210019997 has 2 divisors, whose sum is σ = 221000210019998. Its totient is φ = 221000210019996.

The previous prime is 221000210019947. The next prime is 221000210020033. The reversal of 221000210019997 is 799910012000122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 140877410134041 + 80122799885956 = 11869179^2 + 8951134^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221000210019997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221000210019917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110500105009998 + 110500105009999.

It is an arithmetic number, because the mean of its divisors is an integer number (110500105009999).

Almost surely, 2^{221000210019997} is an apocalyptic number.

It is an amenable number.

221000210019997 is a deficient number, since it is larger than the sum of its proper divisors (1).

221000210019997 is an equidigital number, since it uses as much as digits as its factorization.

221000210019997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40824, while the sum is 43.

The spelling of 221000210019997 in words is "two hundred twenty-one trillion, two hundred ten million, nineteen thousand, nine hundred ninety-seven".