13805421250 has 20 divisors (see below), whose sum is σ = 25876883934. Its totient is φ = 5522168000.

The previous prime is 13805421247. The next prime is 13805421257. The reversal of 13805421250 is 5212450831.

It can be written as a sum of positive squares in 5 ways, for example, as 680740281 + 13124680969 = 26091^2 + 114563^2 .

It is not an unprimeable number, because it can be changed into a prime (13805421257) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 5520919 + ... + 5523418.

Almost surely, 2^13805421250 is an apocalyptic number.

13805421250 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

13805421250 is a deficient number, since it is larger than the sum of its proper divisors (12071462684).

13805421250 is an equidigital number, since it uses as much as digits as its factorization.

13805421250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11044359 (or 11044344 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 31.

The spelling of 13805421250 in words is "thirteen billion, eight hundred five million, four hundred twenty-one thousand, two hundred fifty".