232521433011821 has 2 divisors, whose sum is σ = 232521433011822. Its totient is φ = 232521433011820.

The previous prime is 232521433011811. The next prime is 232521433011827. The reversal of 232521433011821 is 128110334125232.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 184376069605225 + 48145363406596 = 13578515^2 + 6938686^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-232521433011821 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (232521433011827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 116260716505910 + 116260716505911.

It is an arithmetic number, because the mean of its divisors is an integer number (116260716505911).

Almost surely, 2^{232521433011821} is an apocalyptic number.

It is an amenable number.

232521433011821 is a deficient number, since it is larger than the sum of its proper divisors (1).

232521433011821 is an equidigital number, since it uses as much as digits as its factorization.

232521433011821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 69120, while the sum is 38.

The spelling of 232521433011821 in words is "two hundred thirty-two trillion, five hundred twenty-one billion, four hundred thirty-three million, eleven thousand, eight hundred twenty-one".