123233210521 has 2 divisors, whose sum is σ = 123233210522. Its totient is φ = 123233210520.

The previous prime is 123233210473. The next prime is 123233210539. The reversal of 123233210521 is 125012332321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 113744307600 + 9488902921 = 337260^2 + 97411^2 .

It is an emirp because it is prime and its reverse (125012332321) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 123233210521 - 2²³ = 123224821913 is a prime.

It is not a weakly prime, because it can be changed into another prime (123233010521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61616605260 + 61616605261.

It is an arithmetic number, because the mean of its divisors is an integer number (61616605261).

Almost surely, 2^123233210521 is an apocalyptic number.

It is an amenable number.

123233210521 is a deficient number, since it is larger than the sum of its proper divisors (1).

123233210521 is an equidigital number, since it uses as much as digits as its factorization.

123233210521 is an evil number, because the sum of its binary digits is even.

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

Adding to 123233210521 its reverse (125012332321), we get a palindrome (248245542842).

The spelling of 123233210521 in words is "one hundred twenty-three billion, two hundred thirty-three million, two hundred ten thousand, five hundred twenty-one".