12521723 has 4 divisors (see below), whose sum is σ = 12528840. Its totient is φ = 12514608.

The previous prime is 12521711. The next prime is 12521731. The reversal of 12521723 is 32712521.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 12521723 - 2¹⁰ = 12520699 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12521753) 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, 1223 + ... + 5151.

It is an arithmetic number, because the mean of its divisors is an integer number (3132210).

Almost surely, 2^12521723 is an apocalyptic number.

12521723 is a deficient number, since it is larger than the sum of its proper divisors (7117).

12521723 is an equidigital number, since it uses as much as digits as its factorization.

12521723 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7116.

The product of its digits is 840, while the sum is 23.

The square root of 12521723 is about 3538.6046685099. The cubic root of 12521723 is about 232.2138028569.

The spelling of 12521723 in words is "twelve million, five hundred twenty-one thousand, seven hundred twenty-three".