13530152021 has 4 divisors (see below), whose sum is σ = 13530424044. Its totient is φ = 13529880000.

The previous prime is 13530151963. The next prime is 13530152029. The reversal of 13530152021 is 12025103531.

It is a happy number.

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 10308340900 + 3221811121 = 101530^2 + 56761^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13530152021 is a prime.

It is a super-2 number, since 2×13530152021² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13530152029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37730 + ... + 168771.

It is an arithmetic number, because the mean of its divisors is an integer number (3382606011).

Almost surely, 2^13530152021 is an apocalyptic number.

It is an amenable number.

13530152021 is a deficient number, since it is larger than the sum of its proper divisors (272023).

13530152021 is an equidigital number, since it uses as much as digits as its factorization.

13530152021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 272022.

The product of its (nonzero) digits is 900, while the sum is 23.

Adding to 13530152021 its reverse (12025103531), we get a palindrome (25555255552).

The spelling of 13530152021 in words is "thirteen billion, five hundred thirty million, one hundred fifty-two thousand, twenty-one".