12548721321 has 12 divisors (see below), whose sum is σ = 18217943172. Its totient is φ = 8323346976.

The previous prime is 12548721281. The next prime is 12548721359. The reversal of 12548721321 is 12312784521.

12548721321 is a `hidden beast` number, since 1 + 254 + 87 + 2 + 1 + 321 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 12414416400 + 134304921 = 111420^2 + 11589^2 .

It is not a de Polignac number, because 12548721321 - 2⁹ = 12548720809 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12548721221) 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, 3537066 + ... + 3540611.

It is an arithmetic number, because the mean of its divisors is an integer number (1518161931).

Almost surely, 2^12548721321 is an apocalyptic number.

It is an amenable number.

12548721321 is a deficient number, since it is larger than the sum of its proper divisors (5669221851).

12548721321 is a wasteful number, since it uses less digits than its factorization.

12548721321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7077880 (or 7077877 counting only the distinct ones).

The product of its digits is 26880, while the sum is 36.

The spelling of 12548721321 in words is "twelve billion, five hundred forty-eight million, seven hundred twenty-one thousand, three hundred twenty-one".