12921541 has 4 divisors (see below), whose sum is σ = 12952800. Its totient is φ = 12890284.

The previous prime is 12921527. The next prime is 12921583. The reversal of 12921541 is 14512921.

It is a happy number.

12921541 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12921541 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 (12921941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15001 + ... + 15838.

It is an arithmetic number, because the mean of its divisors is an integer number (3238200).

Almost surely, 2^12921541 is an apocalyptic number.

It is an amenable number.

12921541 is a deficient number, since it is larger than the sum of its proper divisors (31259).

12921541 is an equidigital number, since it uses as much as digits as its factorization.

12921541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31258.

The product of its digits is 720, while the sum is 25.

The square root of 12921541 is about 3594.6545035650. The cubic root of 12921541 is about 234.6594796550.

The spelling of 12921541 in words is "twelve million, nine hundred twenty-one thousand, five hundred forty-one".