13521111238 has 8 divisors (see below), whose sum is σ = 20282373432. Its totient is φ = 6760320096.

The previous prime is 13521111209. The next prime is 13521111239. The reversal of 13521111238 is 83211112531.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×13521111238² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13521111239) 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, 34120 + ... + 167947.

It is an arithmetic number, because the mean of its divisors is an integer number (2535296679).

Almost surely, 2^13521111238 is an apocalyptic number.

13521111238 is a deficient number, since it is larger than the sum of its proper divisors (6761262194).

13521111238 is a wasteful number, since it uses less digits than its factorization.

13521111238 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 235526.

The product of its digits is 1440, while the sum is 28.

Adding to 13521111238 its reverse (83211112531), we get a palindrome (96732223769).

The spelling of 13521111238 in words is "thirteen billion, five hundred twenty-one million, one hundred eleven thousand, two hundred thirty-eight".