12221311420 has 12 divisors (see below), whose sum is σ = 25664754024. Its totient is φ = 4888524560.

The previous prime is 12221311409. The next prime is 12221311429. The reversal of 12221311420 is 2411312221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12221311429) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 305532766 + ... + 305532805.

It is an arithmetic number, because the mean of its divisors is an integer number (2138729502).

Almost surely, 2^12221311420 is an apocalyptic number.

12221311420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12221311420 is an abundant number, since it is smaller than the sum of its proper divisors (13443442604).

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

12221311420 is a wasteful number, since it uses less digits than its factorization.

12221311420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 611065580 (or 611065578 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 12221311420 its reverse (2411312221), we get a palindrome (14632623641).

The spelling of 12221311420 in words is "twelve billion, two hundred twenty-one million, three hundred eleven thousand, four hundred twenty".