12921549 has 4 divisors (see below), whose sum is σ = 17228736. Its totient is φ = 8614364.

The previous prime is 12921527. The next prime is 12921583. The reversal of 12921549 is 94512921.

12921549 is digitally balanced in base 2 and base 4, because in such bases 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 not a de Polignac number, because 12921549 - 2¹² = 12917453 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12921589) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2153589 + ... + 2153594.

It is an arithmetic number, because the mean of its divisors is an integer number (4307184).

Almost surely, 2^12921549 is an apocalyptic number.

It is an amenable number.

12921549 is a deficient number, since it is larger than the sum of its proper divisors (4307187).

12921549 is an equidigital number, since it uses as much as digits as its factorization.

12921549 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4307186.

The product of its digits is 6480, while the sum is 33.

The square root of 12921549 is about 3594.6556163282. The cubic root of 12921549 is about 234.6595280825.

The spelling of 12921549 in words is "twelve million, nine hundred twenty-one thousand, five hundred forty-nine".