23243051521 has 2 divisors, whose sum is σ = 23243051522. Its totient is φ = 23243051520.

The previous prime is 23243051453. The next prime is 23243051537. The reversal of 23243051521 is 12515034232.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17236801521 + 6006250000 = 131289^2 + 77500^2 .

It is a cyclic number.

It is not a de Polignac number, because 23243051521 - 2⁷ = 23243051393 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 23243051521.

It is not a weakly prime, because it can be changed into another prime (23243051551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11621525760 + 11621525761.

It is an arithmetic number, because the mean of its divisors is an integer number (11621525761).

Almost surely, 2^23243051521 is an apocalyptic number.

It is an amenable number.

23243051521 is a deficient number, since it is larger than the sum of its proper divisors (1).

23243051521 is an equidigital number, since it uses as much as digits as its factorization.

23243051521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7200, while the sum is 28.

Adding to 23243051521 its reverse (12515034232), we get a palindrome (35758085753).

The spelling of 23243051521 in words is "twenty-three billion, two hundred forty-three million, fifty-one thousand, five hundred twenty-one".