13431221312 has 112 divisors (see below), whose sum is σ = 28581949440. Its totient is φ = 6247008768.

The previous prime is 13431221299. The next prime is 13431221339. The reversal of 13431221312 is 21312213431.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28039889 + ... + 28040367.

Almost surely, 2^13431221312 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 13431221312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14290974720).

13431221312 is an abundant number, since it is smaller than the sum of its proper divisors (15150728128).

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

13431221312 is a wasteful number, since it uses less digits than its factorization.

13431221312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1000 (or 990 counting only the distinct ones).

The product of its digits is 864, while the sum is 23.

Adding to 13431221312 its reverse (21312213431), we get a palindrome (34743434743).

The spelling of 13431221312 in words is "thirteen billion, four hundred thirty-one million, two hundred twenty-one thousand, three hundred twelve".