13421381 has 4 divisors (see below), whose sum is σ = 14210892. Its totient is φ = 12631872.

The previous prime is 13421363. The next prime is 13421393. The reversal of 13421381 is 18312431.

13421381 = 2590² + 2591².

13421381 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.

It can be written as a sum of positive squares in 2 ways, for example, as 6713281 + 6708100 = 2591^2 + 2590^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13421381 is a prime.

It is a super-2 number, since 2×13421381² = 360266935894322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13421981) 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, 394730 + ... + 394763.

It is an arithmetic number, because the mean of its divisors is an integer number (3552723).

Almost surely, 2^13421381 is an apocalyptic number.

13421381 is the 2591-st centered square number.

It is an amenable number.

13421381 is a deficient number, since it is larger than the sum of its proper divisors (789511).

13421381 is an equidigital number, since it uses as much as digits as its factorization.

13421381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 789510.

The product of its digits is 576, while the sum is 23.

The square root of 13421381 is about 3663.5203015679. The cubic root of 13421381 is about 237.6470358214.

The spelling of 13421381 in words is "thirteen million, four hundred twenty-one thousand, three hundred eighty-one".