12521155 has 8 divisors (see below), whose sum is σ = 15089184. Its totient is φ = 9974400.

The previous prime is 12521149. The next prime is 12521189. The reversal of 12521155 is 55112521.

It is a happy number.

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

It is not a de Polignac number, because 12521155 - 2⁹ = 12520643 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, 3991 + ... + 6400.

It is an arithmetic number, because the mean of its divisors is an integer number (1886148).

Almost surely, 2^12521155 is an apocalyptic number.

12521155 is a deficient number, since it is larger than the sum of its proper divisors (2568029).

12521155 is a wasteful number, since it uses less digits than its factorization.

12521155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10637.

The product of its digits is 500, while the sum is 22.

The square root of 12521155 is about 3538.5244099766. The cubic root of 12521155 is about 232.2102916406.

Adding to 12521155 its reverse (55112521), we get a palindrome (67633676).

The spelling of 12521155 in words is "twelve million, five hundred twenty-one thousand, one hundred fifty-five".