12547121 has 4 divisors (see below), whose sum is σ = 13092672. Its totient is φ = 12001572.

The previous prime is 12547109. The next prime is 12547133. The reversal of 12547121 is 12174521.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12174521 = 23 ⋅529327.

It is an interprime number because it is at equal distance from previous prime (12547109) and next prime (12547133).

It is a cyclic number.

It is not a de Polignac number, because 12547121 - 2⁶ = 12547057 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23), and also a Moran number because the ratio is a prime number: 545527 = 12547121 / (1 + 2 + 5 + 4 + 7 + 1 + 2 + 1).

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12547321) 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, 272741 + ... + 272786.

It is an arithmetic number, because the mean of its divisors is an integer number (3273168).

Almost surely, 2^12547121 is an apocalyptic number.

It is an amenable number.

12547121 is a deficient number, since it is larger than the sum of its proper divisors (545551).

12547121 is an equidigital number, since it uses as much as digits as its factorization.

12547121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 545550.

The product of its digits is 560, while the sum is 23.

The square root of 12547121 is about 3542.1915532619. The cubic root of 12547121 is about 232.3706977492.

The spelling of 12547121 in words is "twelve million, five hundred forty-seven thousand, one hundred twenty-one".