12748221 has 12 divisors (see below), whose sum is σ = 19383520. Its totient is φ = 8051400.

The previous prime is 12748217. The next prime is 12748231. The reversal of 12748221 is 12284721.

12748221 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 not a de Polignac number, because 12748221 - 2² = 12748217 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 (12748231) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 37105 + ... + 37446.

Almost surely, 2^12748221 is an apocalyptic number.

It is an amenable number.

12748221 is a deficient number, since it is larger than the sum of its proper divisors (6635299).

12748221 is a wasteful number, since it uses less digits than its factorization.

12748221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74576 (or 74573 counting only the distinct ones).

The product of its digits is 1792, while the sum is 27.

The square root of 12748221 is about 3570.4650957543. The cubic root of 12748221 is about 233.6055704577.

The spelling of 12748221 in words is "twelve million, seven hundred forty-eight thousand, two hundred twenty-one".