13530221052 has 24 divisors (see below), whose sum is σ = 33427605456. Its totient is φ = 4244775168.

The previous prime is 13530221039. The next prime is 13530221099. The reversal of 13530221052 is 25012203531.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33162103 + ... + 33162510.

It is an arithmetic number, because the mean of its divisors is an integer number (1392816894).

Almost surely, 2^13530221052 is an apocalyptic number.

13530221052 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

13530221052 is an abundant number, since it is smaller than the sum of its proper divisors (19897384404).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

13530221052 is a wasteful number, since it uses less digits than its factorization.

13530221052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66324637 (or 66324635 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 24.

Adding to 13530221052 its reverse (25012203531), we get a palindrome (38542424583).

The spelling of 13530221052 in words is "thirteen billion, five hundred thirty million, two hundred twenty-one thousand, fifty-two".