13113621 has 6 divisors (see below), whose sum is σ = 18941910. Its totient is φ = 8742408.

The previous prime is 13113619. The next prime is 13113637. The reversal of 13113621 is 12631131.

13113621 is a `hidden beast` number, since 1 + 31 + 13 + 621 = 666.

It can be written as a sum of positive squares in only one way, i.e., 6687396 + 6426225 = 2586^2 + 2535^2 .

It is not a de Polignac number, because 13113621 - 2¹ = 13113619 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 13113594 and 13113603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13113601) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 728526 + ... + 728543.

It is an arithmetic number, because the mean of its divisors is an integer number (3156985).

Almost surely, 2^13113621 is an apocalyptic number.

It is an amenable number.

13113621 is a deficient number, since it is larger than the sum of its proper divisors (5828289).

13113621 is a wasteful number, since it uses less digits than its factorization.

13113621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1457075 (or 1457072 counting only the distinct ones).

The product of its digits is 108, while the sum is 18.

The square root of 13113621 is about 3621.2733948157. The cubic root of 13113621 is about 235.8165108748.

Adding to 13113621 its reverse (12631131), we get a palindrome (25744752).

The spelling of 13113621 in words is "thirteen million, one hundred thirteen thousand, six hundred twenty-one".