13255321520 has 80 divisors (see below), whose sum is σ = 35667240960. Its totient is φ = 4487139072.

The previous prime is 13255321511. The next prime is 13255321523. The reversal of 13255321520 is 2512355231.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×13255321520² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (13255321523) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 105572 + ... + 194051.

It is an arithmetic number, because the mean of its divisors is an integer number (445840512).

Almost surely, 2^13255321520 is an apocalyptic number.

13255321520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13255321520 is an abundant number, since it is smaller than the sum of its proper divisors (22411919440).

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

13255321520 is a wasteful number, since it uses less digits than its factorization.

13255321520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 299722 (or 299716 counting only the distinct ones).

The product of its (nonzero) digits is 9000, while the sum is 29.

Adding to 13255321520 its reverse (2512355231), we get a palindrome (15767676751).

The spelling of 13255321520 in words is "thirteen billion, two hundred fifty-five million, three hundred twenty-one thousand, five hundred twenty".