12521220 has 24 divisors (see below), whose sum is σ = 35059584. Its totient is φ = 3338976.

The previous prime is 12521219. The next prime is 12521233. The reversal of 12521220 is 2212521.

12521220 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 12521220.

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, 104284 + ... + 104403.

It is an arithmetic number, because the mean of its divisors is an integer number (1460816).

Almost surely, 2^12521220 is an apocalyptic number.

12521220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12521220 is an abundant number, since it is smaller than the sum of its proper divisors (22538364).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12521220 is a wasteful number, since it uses less digits than its factorization.

12521220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 208699 (or 208697 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 15.

The square root of 12521220 is about 3538.5335945841. The cubic root of 12521220 is about 232.2106934577.

Adding to 12521220 its reverse (2212521), we get a palindrome (14733741).

The spelling of 12521220 in words is "twelve million, five hundred twenty-one thousand, two hundred twenty".