12212120424 has 32 divisors (see below), whose sum is σ = 34891773120. Its totient is φ = 3489177216.

The previous prime is 12212120419. The next prime is 12212120441. The reversal of 12212120424 is 42402121221.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a self number, because there is not a number n which added to its sum of digits gives 12212120424.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36345429 + ... + 36345764.

It is an arithmetic number, because the mean of its divisors is an integer number (1090367910).

Almost surely, 2^12212120424 is an apocalyptic number.

12212120424 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

12212120424 is an abundant number, since it is smaller than the sum of its proper divisors (22679652696).

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

12212120424 is a wasteful number, since it uses less digits than its factorization.

12212120424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72691209 (or 72691205 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 21.

Adding to 12212120424 its reverse (42402121221), we get a palindrome (54614241645).

The spelling of 12212120424 in words is "twelve billion, two hundred twelve million, one hundred twenty thousand, four hundred twenty-four".