233564636021 has 2 divisors, whose sum is σ = 233564636022. Its totient is φ = 233564636020.

The previous prime is 233564635987. The next prime is 233564636023. The reversal of 233564636021 is 120636465332.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 225899633521 + 7665002500 = 475289^2 + 87550^2 .

It is a cyclic number.

It is not a de Polignac number, because 233564636021 - 2⁶ = 233564635957 is a prime.

Together with 233564636023, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 233564636021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (233564636023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 116782318010 + 116782318011.

It is an arithmetic number, because the mean of its divisors is an integer number (116782318011).

Almost surely, 2^233564636021 is an apocalyptic number.

It is an amenable number.

233564636021 is a deficient number, since it is larger than the sum of its proper divisors (1).

233564636021 is an equidigital number, since it uses as much as digits as its factorization.

233564636021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 466560, while the sum is 41.

The spelling of 233564636021 in words is "two hundred thirty-three billion, five hundred sixty-four million, six hundred thirty-six thousand, twenty-one".