13605621 has 8 divisors (see below), whose sum is σ = 18726144. Its totient is φ = 8777760.

The previous prime is 13605619. The next prime is 13605629. The reversal of 13605621 is 12650631.

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

It is not a de Polignac number, because 13605621 - 2¹ = 13605619 is a prime.

It is a super-2 number, since 2×13605621² = 370225845591282, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 13605591 and 13605600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13605629) 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, 73056 + ... + 73241.

It is an arithmetic number, because the mean of its divisors is an integer number (2340768).

Almost surely, 2^13605621 is an apocalyptic number.

It is an amenable number.

13605621 is a deficient number, since it is larger than the sum of its proper divisors (5120523).

13605621 is a wasteful number, since it uses less digits than its factorization.

13605621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146331.

The product of its (nonzero) digits is 1080, while the sum is 24.

The square root of 13605621 is about 3688.5798080020. The cubic root of 13605621 is about 238.7295189982.

The spelling of 13605621 in words is "thirteen million, six hundred five thousand, six hundred twenty-one".