201321997 has 2 divisors, whose sum is σ = 201321998. Its totient is φ = 201321996.

The previous prime is 201321977. The next prime is 201322039. The reversal of 201321997 is 799123102.

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., 178863876 + 22458121 = 13374^2 + 4739^2 .

It is a cyclic number.

It is not a de Polignac number, because 201321997 - 2¹¹ = 201319949 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201321917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100660998 + 100660999.

It is an arithmetic number, because the mean of its divisors is an integer number (100660999).

Almost surely, 2^201321997 is an apocalyptic number.

It is an amenable number.

201321997 is a deficient number, since it is larger than the sum of its proper divisors (1).

201321997 is an equidigital number, since it uses as much as digits as its factorization.

201321997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6804, while the sum is 34.

The square root of 201321997 is about 14188.7982930197. The cubic root of 201321997 is about 586.0892332284.

The spelling of 201321997 in words is "two hundred one million, three hundred twenty-one thousand, nine hundred ninety-seven".