12221255420 has 48 divisors (see below), whose sum is σ = 28118065248. Its totient is φ = 4425000960.

The previous prime is 12221255419. The next prime is 12221255447. The reversal of 12221255420 is 2455212221.

It is a self number, because there is not a number n which added to its sum of digits gives 12221255420.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 67949 + ... + 170468.

It is an arithmetic number, because the mean of its divisors is an integer number (585793026).

Almost surely, 2^12221255420 is an apocalyptic number.

12221255420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12221255420 is an abundant number, since it is smaller than the sum of its proper divisors (15896809828).

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

12221255420 is a wasteful number, since it uses less digits than its factorization.

12221255420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 238670 (or 238668 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 26.

Adding to 12221255420 its reverse (2455212221), we get a palindrome (14676467641).

The spelling of 12221255420 in words is "twelve billion, two hundred twenty-one million, two hundred fifty-five thousand, four hundred twenty".