12212520 has 32 divisors (see below), whose sum is σ = 36637920. Its totient is φ = 3256640.

The previous prime is 12212507. The next prime is 12212521. The reversal of 12212520 is 2521221.

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 12212520.

It is not an unprimeable number, because it can be changed into a prime (12212521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50766 + ... + 51005.

It is an arithmetic number, because the mean of its divisors is an integer number (1144935).

Almost surely, 2^12212520 is an apocalyptic number.

12212520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12212520 is an abundant number, since it is smaller than the sum of its proper divisors (24425400).

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

12212520 is a wasteful number, since it uses less digits than its factorization.

12212520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101785 (or 101781 counting only the distinct ones).

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

The square root of 12212520 is about 3494.6416125262. The cubic root of 12212520 is about 230.2864735362.

Adding to 12212520 its reverse (2521221), we get a palindrome (14733741).

It can be divided in two parts, 1221 and 2520, that added together give a triangular number (3741 = T₈₆).

The spelling of 12212520 in words is "twelve million, two hundred twelve thousand, five hundred twenty".