13081621 has 8 divisors (see below), whose sum is σ = 15099264. Its totient is φ = 11101200.

The previous prime is 13081613. The next prime is 13081631. The reversal of 13081621 is 12618031.

13081621 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 13081621 - 2³ = 13081613 is a prime.

It is a super-2 number, since 2×13081621² = 342257615975282, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13081592 and 13081601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13081631) 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, 8545 + ... + 9958.

It is an arithmetic number, because the mean of its divisors is an integer number (1887408).

Almost surely, 2^13081621 is an apocalyptic number.

It is an amenable number.

13081621 is a deficient number, since it is larger than the sum of its proper divisors (2017643).

13081621 is a wasteful number, since it uses less digits than its factorization.

13081621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18611.

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 13081621 is about 3616.8523608243. The cubic root of 13081621 is about 235.6245406394.

Adding to 13081621 its reverse (12618031), we get a palindrome (25699652).

The spelling of 13081621 in words is "thirteen million, eighty-one thousand, six hundred twenty-one".