201042521 has 2 divisors, whose sum is σ = 201042522. Its totient is φ = 201042520.

The previous prime is 201042487. The next prime is 201042539. The reversal of 201042521 is 125240102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 116402521 + 84640000 = 10789^2 + 9200^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-201042521 is a prime.

It is a Chen prime.

It is equal to p_11133512 and since 201042521 and 11133512 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 201042521.

It is not a weakly prime, because it can be changed into another prime (201042551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100521260 + 100521261.

It is an arithmetic number, because the mean of its divisors is an integer number (100521261).

Almost surely, 2^201042521 is an apocalyptic number.

It is an amenable number.

201042521 is a deficient number, since it is larger than the sum of its proper divisors (1).

201042521 is an equidigital number, since it uses as much as digits as its factorization.

201042521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 160, while the sum is 17.

The square root of 201042521 is about 14178.9463995037. The cubic root of 201042521 is about 585.8179038316.

Adding to 201042521 its reverse (125240102), we get a palindrome (326282623).

The spelling of 201042521 in words is "two hundred one million, forty-two thousand, five hundred twenty-one".