12521555 has 8 divisors (see below), whose sum is σ = 15082944. Its totient is φ = 9979200.

The previous prime is 12521543. The next prime is 12521569. The reversal of 12521555 is 55512521.

12521555 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12521555 - 2¹⁰ = 12520531 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3266 + ... + 5975.

It is an arithmetic number, because the mean of its divisors is an integer number (1885368).

Almost surely, 2^12521555 is an apocalyptic number.

12521555 is a deficient number, since it is larger than the sum of its proper divisors (2561389).

12521555 is an equidigital number, since it uses as much as digits as its factorization.

12521555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9517.

The product of its digits is 2500, while the sum is 26.

The square root of 12521555 is about 3538.5809302600. The cubic root of 12521555 is about 232.2127643392.

The spelling of 12521555 in words is "twelve million, five hundred twenty-one thousand, five hundred fifty-five".