13530122821 has 2 divisors, whose sum is σ = 13530122822. Its totient is φ = 13530122820.

The previous prime is 13530122797. The next prime is 13530122849. The reversal of 13530122821 is 12822103531.

It is an a-pointer prime, because the next prime (13530122849) can be obtained adding 13530122821 to its sum of digits (28).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8322912900 + 5207209921 = 91230^2 + 72161^2 .

It is a cyclic number.

It is not a de Polignac number, because 13530122821 - 2⁷ = 13530122693 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 13530122821.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13530125821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6765061410 + 6765061411.

It is an arithmetic number, because the mean of its divisors is an integer number (6765061411).

Almost surely, 2^13530122821 is an apocalyptic number.

It is an amenable number.

13530122821 is a deficient number, since it is larger than the sum of its proper divisors (1).

13530122821 is an equidigital number, since it uses as much as digits as its factorization.

13530122821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2880, while the sum is 28.

The spelling of 13530122821 in words is "thirteen billion, five hundred thirty million, one hundred twenty-two thousand, eight hundred twenty-one".