13230515621 has 2 divisors, whose sum is σ = 13230515622. Its totient is φ = 13230515620.

The previous prime is 13230515581. The next prime is 13230515629. The reversal of 13230515621 is 12651503231.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12763350625 + 467164996 = 112975^2 + 21614^2 .

It is a cyclic number.

It is not a de Polignac number, because 13230515621 - 2¹⁰ = 13230514597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13230515629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6615257810 + 6615257811.

It is an arithmetic number, because the mean of its divisors is an integer number (6615257811).

Almost surely, 2^13230515621 is an apocalyptic number.

It is an amenable number.

13230515621 is a deficient number, since it is larger than the sum of its proper divisors (1).

13230515621 is an equidigital number, since it uses as much as digits as its factorization.

13230515621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5400, while the sum is 29.

The spelling of 13230515621 in words is "thirteen billion, two hundred thirty million, five hundred fifteen thousand, six hundred twenty-one".