202221021997 has 2 divisors, whose sum is σ = 202221021998. Its totient is φ = 202221021996.

The previous prime is 202221021929. The next prime is 202221022001. The reversal of 202221021997 is 799120122202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 108458907561 + 93762114436 = 329331^2 + 306206^2 .

It is a cyclic number.

It is not a de Polignac number, because 202221021997 - 2³¹ = 200073538349 is a prime.

It is a super-2 number, since 2×202221021997² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (202221021907) 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, 101110510998 + 101110510999.

It is an arithmetic number, because the mean of its divisors is an integer number (101110510999).

Almost surely, 2^202221021997 is an apocalyptic number.

It is an amenable number.

202221021997 is a deficient number, since it is larger than the sum of its proper divisors (1).

202221021997 is an equidigital number, since it uses as much as digits as its factorization.

202221021997 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 37.

The spelling of 202221021997 in words is "two hundred two billion, two hundred twenty-one million, twenty-one thousand, nine hundred ninety-seven".