12512220 has 96 divisors (see below), whose sum is σ = 41373696. Its totient is φ = 2767680.

The previous prime is 12512191. The next prime is 12512231. The reversal of 12512220 is 2221521.

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 12512220.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 403605 + ... + 403635.

It is an arithmetic number, because the mean of its divisors is an integer number (430976).

Almost surely, 2^12512220 is an apocalyptic number.

12512220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12512220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20686848).

12512220 is an abundant number, since it is smaller than the sum of its proper divisors (28861476).

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

12512220 is an equidigital number, since it uses as much as digits as its factorization.

12512220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112 (or 48 counting only the distinct ones).

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

The square root of 12512220 is about 3537.2616527478. The cubic root of 12512220 is about 232.1550440038.

Adding to 12512220 its reverse (2221521), we get a palindrome (14733741).

The spelling of 12512220 in words is "twelve million, five hundred twelve thousand, two hundred twenty".