13755421 has 4 divisors (see below), whose sum is σ = 13763200. Its totient is φ = 13747644.

The previous prime is 13755419. The next prime is 13755433. The reversal of 13755421 is 12455731.

It is a happy number.

13755421 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 a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 13755421 - 2¹ = 13755419 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 13755421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13765421) 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, 190 + ... + 5248.

It is an arithmetic number, because the mean of its divisors is an integer number (3440800).

Almost surely, 2^13755421 is an apocalyptic number.

It is an amenable number.

13755421 is a deficient number, since it is larger than the sum of its proper divisors (7779).

13755421 is an equidigital number, since it uses as much as digits as its factorization.

13755421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7778.

The product of its digits is 4200, while the sum is 28.

The square root of 13755421 is about 3708.8301390061. The cubic root of 13755421 is about 239.6024727008.

The spelling of 13755421 in words is "thirteen million, seven hundred fifty-five thousand, four hundred twenty-one".