12521621 has 8 divisors (see below), whose sum is σ = 14580864. Its totient is φ = 10530000.

The previous prime is 12521603. The next prime is 12521623. The reversal of 12521621 is 12612521.

12521621 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 12521621 - 2¹⁰ = 12520597 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12521593 and 12521602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12521623) 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, 16505 + ... + 17246.

It is an arithmetic number, because the mean of its divisors is an integer number (1822608).

Almost surely, 2^12521621 is an apocalyptic number.

It is an amenable number.

12521621 is a deficient number, since it is larger than the sum of its proper divisors (2059243).

12521621 is an equidigital number, since it uses as much as digits as its factorization.

12521621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33811.

The product of its digits is 240, while the sum is 20.

The square root of 12521621 is about 3538.5902560200. The cubic root of 12521621 is about 232.2131723294.

The spelling of 12521621 in words is "twelve million, five hundred twenty-one thousand, six hundred twenty-one".