221212220120 has 16 divisors (see below), whose sum is σ = 497727495360. Its totient is φ = 88484888032.

The previous prime is 221212220083. The next prime is 221212220137. The reversal of 221212220120 is 21022212122.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2765152712 + ... + 2765152791.

It is an arithmetic number, because the mean of its divisors is an integer number (31107968460).

Almost surely, 2^221212220120 is an apocalyptic number.

221212220120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221212220120 is an abundant number, since it is smaller than the sum of its proper divisors (276515275240).

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

221212220120 is a wasteful number, since it uses less digits than its factorization.

221212220120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5530305514 (or 5530305510 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 221212220120 its reverse (21022212122), we get a palindrome (242234432242).

The spelling of 221212220120 in words is "two hundred twenty-one billion, two hundred twelve million, two hundred twenty thousand, one hundred twenty".