201242521 has 2 divisors, whose sum is σ = 201242522. Its totient is φ = 201242520.

The previous prime is 201242507. The next prime is 201242527. The reversal of 201242521 is 125242102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 110250000 + 90992521 = 10500^2 + 9539^2 .

It is a cyclic number.

It is not a de Polignac number, because 201242521 - 2¹³ = 201234329 is a prime.

It is not a weakly prime, because it can be changed into another prime (201242527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100621260 + 100621261.

It is an arithmetic number, because the mean of its divisors is an integer number (100621261).

Almost surely, 2^201242521 is an apocalyptic number.

It is an amenable number.

201242521 is a deficient number, since it is larger than the sum of its proper divisors (1).

201242521 is an equidigital number, since it uses as much as digits as its factorization.

201242521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 320, while the sum is 19.

The square root of 201242521 is about 14185.9973565485. The cubic root of 201242521 is about 586.0120994834.

Adding to 201242521 its reverse (125242102), we get a palindrome (326484623).

The spelling of 201242521 in words is "two hundred one million, two hundred forty-two thousand, five hundred twenty-one".