13809021255 has 24 divisors (see below), whose sum is σ = 24096290400. Its totient is φ = 7315379520.

The previous prime is 13809021253. The next prime is 13809021293. The reversal of 13809021255 is 55212090831.

13809021255 is a `hidden beast` number, since 1 + 380 + 9 + 0 + 21 + 255 = 666.

It is not a de Polignac number, because 13809021255 - 2¹ = 13809021253 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13809021251) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1023051 + ... + 1036460.

It is an arithmetic number, because the mean of its divisors is an integer number (1004012100).

Almost surely, 2^13809021255 is an apocalyptic number.

13809021255 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

13809021255 is a deficient number, since it is larger than the sum of its proper divisors (10287269145).

13809021255 is a wasteful number, since it uses less digits than its factorization.

13809021255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2059671 (or 2059668 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 36.

The spelling of 13809021255 in words is "thirteen billion, eight hundred nine million, twenty-one thousand, two hundred fifty-five".