133021232521 has 2 divisors, whose sum is σ = 133021232522. Its totient is φ = 133021232520.

The previous prime is 133021232507. The next prime is 133021232567. The reversal of 133021232521 is 125232120331.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 86753222521 + 46268010000 = 294539^2 + 215100^2 .

It is a cyclic number.

It is not a de Polignac number, because 133021232521 - 2¹⁷ = 133021101449 is a prime.

It is not a weakly prime, because it can be changed into another prime (133021232621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66510616260 + 66510616261.

It is an arithmetic number, because the mean of its divisors is an integer number (66510616261).

Almost surely, 2^133021232521 is an apocalyptic number.

It is an amenable number.

133021232521 is a deficient number, since it is larger than the sum of its proper divisors (1).

133021232521 is an equidigital number, since it uses as much as digits as its factorization.

133021232521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2160, while the sum is 25.

Adding to 133021232521 its reverse (125232120331), we get a palindrome (258253352852).

The spelling of 133021232521 in words is "one hundred thirty-three billion, twenty-one million, two hundred thirty-two thousand, five hundred twenty-one".