201540533521 has 2 divisors, whose sum is σ = 201540533522. Its totient is φ = 201540533520.

The previous prime is 201540533507. The next prime is 201540533531. The reversal of 201540533521 is 125335045102.

201540533521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 155973654225 + 45566879296 = 394935^2 + 213464^2 .

It is a cyclic number.

It is not a de Polignac number, because 201540533521 - 2⁷ = 201540533393 is a prime.

It is not a weakly prime, because it can be changed into another prime (201540533531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100770266760 + 100770266761.

It is an arithmetic number, because the mean of its divisors is an integer number (100770266761).

Almost surely, 2^201540533521 is an apocalyptic number.

It is an amenable number.

201540533521 is a deficient number, since it is larger than the sum of its proper divisors (1).

201540533521 is an equidigital number, since it uses as much as digits as its factorization.

201540533521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18000, while the sum is 31.

Adding to 201540533521 its reverse (125335045102), we get a palindrome (326875578623).

The spelling of 201540533521 in words is "two hundred one billion, five hundred forty million, five hundred thirty-three thousand, five hundred twenty-one".