13921281 has 32 divisors (see below), whose sum is σ = 23692800. Its totient is φ = 7989840.

The previous prime is 13921241. The next prime is 13921289. The reversal of 13921281 is 18212931.

It is not a de Polignac number, because 13921281 - 2⁶ = 13921217 is a prime.

It is a super-2 number, since 2×13921281² = 387604129361922, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (13921289) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4410 + ... + 6876.

It is an arithmetic number, because the mean of its divisors is an integer number (740400).

Almost surely, 2^13921281 is an apocalyptic number.

13921281 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

13921281 is a deficient number, since it is larger than the sum of its proper divisors (9771519).

13921281 is a wasteful number, since it uses less digits than its factorization.

13921281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2506 (or 2500 counting only the distinct ones).

The product of its digits is 864, while the sum is 27.

The square root of 13921281 is about 3731.1232893058. The cubic root of 13921281 is about 240.5616533311.

The spelling of 13921281 in words is "thirteen million, nine hundred twenty-one thousand, two hundred eighty-one".