13040020251 has 8 divisors (see below), whose sum is σ = 19318548560. Its totient is φ = 8693346816.

The previous prime is 13040020243. The next prime is 13040020261. The reversal of 13040020251 is 15202004031.

13040020251 is a `hidden beast` number, since 13 + 0 + 400 + 2 + 0 + 251 = 666.

It is not a de Polignac number, because 13040020251 - 2³ = 13040020243 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13040020261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 241481830 + ... + 241481883.

It is an arithmetic number, because the mean of its divisors is an integer number (2414818570).

Almost surely, 2^13040020251 is an apocalyptic number.

13040020251 is a deficient number, since it is larger than the sum of its proper divisors (6278528309).

13040020251 is an equidigital number, since it uses as much as digits as its factorization.

13040020251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 482963722 (or 482963716 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

Adding to 13040020251 its reverse (15202004031), we get a palindrome (28242024282).

The spelling of 13040020251 in words is "thirteen billion, forty million, twenty thousand, two hundred fifty-one".