13635421 has 4 divisors (see below), whose sum is σ = 13643100. Its totient is φ = 13627744.

The previous prime is 13635379. The next prime is 13635463. The reversal of 13635421 is 12453631.

13635421 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 brilliant number, because the two primes have the same length.

It is an interprime number because it is at equal distance from previous prime (13635379) and next prime (13635463).

It can be written as a sum of positive squares in 2 ways, for example, as 9060100 + 4575321 = 3010^2 + 2139^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13635421 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13635221) 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, 345 + ... + 5233.

It is an arithmetic number, because the mean of its divisors is an integer number (3410775).

Almost surely, 2^13635421 is an apocalyptic number.

It is an amenable number.

13635421 is a deficient number, since it is larger than the sum of its proper divisors (7679).

13635421 is an equidigital number, since it uses as much as digits as its factorization.

13635421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7678.

The product of its digits is 2160, while the sum is 25.

The square root of 13635421 is about 3692.6170936072. The cubic root of 13635421 is about 238.9036860333.

The spelling of 13635421 in words is "thirteen million, six hundred thirty-five thousand, four hundred twenty-one".