13023621 has 24 divisors (see below), whose sum is σ = 20416760. Its totient is φ = 7952256.

The previous prime is 13023611. The next prime is 13023623. The reversal of 13023621 is 12632031.

13023621 is a `hidden beast` number, since 1 + 302 + 362 + 1 = 666.

13023621 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 171396 + 12852225 = 414^2 + 3585^2 .

It is not a de Polignac number, because 13023621 - 2¹¹ = 13021573 is a prime.

It is a super-2 number, since 2×13023621² = 339229407903282, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 13023594 and 13023603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13023623) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18015 + ... + 18723.

Almost surely, 2^13023621 is an apocalyptic number.

It is an amenable number.

13023621 is a deficient number, since it is larger than the sum of its proper divisors (7393139).

13023621 is a wasteful number, since it uses less digits than its factorization.

13023621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 885 (or 882 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

The square root of 13023621 is about 3608.8254321870. The cubic root of 13023621 is about 235.2757951088.

Adding to 13023621 its reverse (12632031), we get a palindrome (25655652).

The spelling of 13023621 in words is "thirteen million, twenty-three thousand, six hundred twenty-one".