13631421 has 8 divisors (see below), whose sum is σ = 18802080. Its totient is φ = 8774192.

The previous prime is 13631411. The next prime is 13631459. The reversal of 13631421 is 12413631.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 13631421 - 2⁹ = 13630909 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13631411) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 78255 + ... + 78428.

It is an arithmetic number, because the mean of its divisors is an integer number (2350260).

Almost surely, 2^13631421 is an apocalyptic number.

It is an amenable number.

13631421 is a deficient number, since it is larger than the sum of its proper divisors (5170659).

13631421 is a wasteful number, since it uses less digits than its factorization.

13631421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156715.

The product of its digits is 432, while the sum is 21.

The square root of 13631421 is about 3692.0754325989. The cubic root of 13631421 is about 238.8803226622.

The spelling of 13631421 in words is "thirteen million, six hundred thirty-one thousand, four hundred twenty-one".