13721304825 has 36 divisors (see below), whose sum is σ = 25486629168. Its totient is φ = 7318026000.

The previous prime is 13721304781. The next prime is 13721304827. The reversal of 13721304825 is 52840312731.

It is not a de Polignac number, because 13721304825 - 2¹⁰ = 13721303801 is a prime.

It is a super-2 number, since 2×13721304825² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 13721304825.

It is not an unprimeable number, because it can be changed into a prime (13721304827) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1123251 + ... + 1135400.

Almost surely, 2^13721304825 is an apocalyptic number.

13721304825 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

13721304825 is a deficient number, since it is larger than the sum of its proper divisors (11765324343).

13721304825 is an equidigital number, since it uses as much as digits as its factorization.

13721304825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2258676 (or 2258659 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 36.

The spelling of 13721304825 in words is "thirteen billion, seven hundred twenty-one million, three hundred four thousand, eight hundred twenty-five".