13531121450 has 144 divisors (see below), whose sum is σ = 31755675840. Its totient is φ = 4198867200.

The previous prime is 13531121413. The next prime is 13531121503. The reversal of 13531121450 is 5412113531.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 11984486 + ... + 11985614.

Almost surely, 2^13531121450 is an apocalyptic number.

13531121450 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

13531121450 is an abundant number, since it is smaller than the sum of its proper divisors (18224554390).

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

13531121450 is a wasteful number, since it uses less digits than its factorization.

13531121450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1453 (or 1437 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 26.

Adding to 13531121450 its reverse (5412113531), we get a palindrome (18943234981).

The spelling of 13531121450 in words is "thirteen billion, five hundred thirty-one million, one hundred twenty-one thousand, four hundred fifty".