202221019997 has 2 divisors, whose sum is σ = 202221019998. Its totient is φ = 202221019996.

The previous prime is 202221019981. The next prime is 202221020033. The reversal of 202221019997 is 799910122202.

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., 191503387321 + 10717632676 = 437611^2 + 103526^2 .

It is a cyclic number.

It is not a de Polignac number, because 202221019997 - 2⁴ = 202221019981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (202221069997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101110509998 + 101110509999.

It is an arithmetic number, because the mean of its divisors is an integer number (101110509999).

Almost surely, 2^202221019997 is an apocalyptic number.

It is an amenable number.

202221019997 is a deficient number, since it is larger than the sum of its proper divisors (1).

202221019997 is an equidigital number, since it uses as much as digits as its factorization.

202221019997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 81648, while the sum is 44.

The spelling of 202221019997 in words is "two hundred two billion, two hundred twenty-one million, nineteen thousand, nine hundred ninety-seven".