13421281 has 4 divisors (see below), whose sum is σ = 13641364. Its totient is φ = 13201200.

The previous prime is 13421267. The next prime is 13421297. The reversal of 13421281 is 18212431.

It is a happy number.

13421281 is nontrivially palindromic in base 15.

13421281 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18212431 = 19 ⋅958549.

It can be written as a sum of positive squares in 2 ways, for example, as 4665600 + 8755681 = 2160^2 + 2959^2 .

It is a cyclic number.

It is not a de Polignac number, because 13421281 - 2¹¹ = 13419233 is a prime.

It is a super-2 number, since 2×13421281² = 360261567361922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13421251) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 109950 + ... + 110071.

It is an arithmetic number, because the mean of its divisors is an integer number (3410341).

Almost surely, 2^13421281 is an apocalyptic number.

It is an amenable number.

13421281 is a deficient number, since it is larger than the sum of its proper divisors (220083).

13421281 is an equidigital number, since it uses as much as digits as its factorization.

13421281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 220082.

The product of its digits is 384, while the sum is 22.

The square root of 13421281 is about 3663.5066534674. The cubic root of 13421281 is about 237.6464455999.

The spelling of 13421281 in words is "thirteen million, four hundred twenty-one thousand, two hundred eighty-one".