201001133521 has 2 divisors, whose sum is σ = 201001133522. Its totient is φ = 201001133520.

The previous prime is 201001133381. The next prime is 201001133527. The reversal of 201001133521 is 125331100102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 101993364496 + 99007769025 = 319364^2 + 314655^2 .

It is a cyclic number.

It is not a de Polignac number, because 201001133521 - 2⁹ = 201001133009 is a prime.

It is not a weakly prime, because it can be changed into another prime (201001133527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100500566760 + 100500566761.

It is an arithmetic number, because the mean of its divisors is an integer number (100500566761).

Almost surely, 2^201001133521 is an apocalyptic number.

It is an amenable number.

201001133521 is a deficient number, since it is larger than the sum of its proper divisors (1).

201001133521 is an equidigital number, since it uses as much as digits as its factorization.

201001133521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 180, while the sum is 19.

Adding to 201001133521 its reverse (125331100102), we get a palindrome (326332233623).

The spelling of 201001133521 in words is "two hundred one billion, one million, one hundred thirty-three thousand, five hundred twenty-one".