13522030021 has 4 divisors (see below), whose sum is σ = 13522636044. Its totient is φ = 13521424000.

The previous prime is 13522030019. The next prime is 13522030031. The reversal of 13522030021 is 12003022531.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9386896996 + 4135133025 = 96886^2 + 64305^2 .

It is a cyclic number.

It is not a de Polignac number, because 13522030021 - 2¹ = 13522030019 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13522030031) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 268210 + ... + 314611.

It is an arithmetic number, because the mean of its divisors is an integer number (3380659011).

Almost surely, 2^13522030021 is an apocalyptic number.

It is an amenable number.

13522030021 is a deficient number, since it is larger than the sum of its proper divisors (606023).

13522030021 is an equidigital number, since it uses as much as digits as its factorization.

13522030021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 606022.

The product of its (nonzero) digits is 360, while the sum is 19.

Adding to 13522030021 its reverse (12003022531), we get a palindrome (25525052552).

The spelling of 13522030021 in words is "thirteen billion, five hundred twenty-two million, thirty thousand, twenty-one".