13125621 has 8 divisors (see below), whose sum is σ = 17908000. Its totient is φ = 8546832.

The previous prime is 13125611. The next prime is 13125653. The reversal of 13125621 is 12652131.

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

It is not a de Polignac number, because 13125621 - 2⁹ = 13125109 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13125611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50746 + ... + 51003.

It is an arithmetic number, because the mean of its divisors is an integer number (2238500).

Almost surely, 2^13125621 is an apocalyptic number.

It is an amenable number.

13125621 is a deficient number, since it is larger than the sum of its proper divisors (4782379).

13125621 is a wasteful number, since it uses less digits than its factorization.

13125621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101795.

The product of its digits is 360, while the sum is 21.

The square root of 13125621 is about 3622.9298916761. The cubic root of 13125621 is about 235.8884191958. Note that the first 3 decimals are identical.

Adding to 13125621 its reverse (12652131), we get a palindrome (25777752).

It can be divided in two parts, 131 and 25621, that added together give a palindrome (25752).

The spelling of 13125621 in words is "thirteen million, one hundred twenty-five thousand, six hundred twenty-one".