12212211220 has 24 divisors (see below), whose sum is σ = 27977066208. Its totient is φ = 4440804000.

The previous prime is 12212211127. The next prime is 12212211223. The reversal of 12212211220 is 2211221221.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 12212211194 and 12212211203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12212211223) by changing a digit.

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, 27754806 + ... + 27755245.

It is an arithmetic number, because the mean of its divisors is an integer number (1165711092).

Almost surely, 2^12212211220 is an apocalyptic number.

12212211220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12212211220 is an abundant number, since it is smaller than the sum of its proper divisors (15764854988).

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

12212211220 is a wasteful number, since it uses less digits than its factorization.

12212211220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55510071 (or 55510069 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 12212211220 its reverse (2211221221), we get a palindrome (14423432441).

The spelling of 12212211220 in words is "twelve billion, two hundred twelve million, two hundred eleven thousand, two hundred twenty".