221222120021220 has 96 divisors (see below), whose sum is σ = 625288668512256. Its totient is φ = 58435301232000.

The previous prime is 221222120021207. The next prime is 221222120021249. The reversal of 221222120021220 is 22120021222122.

It is a super-3 number, since 3×221222120021220³ (a number of 44 digits) contains 333 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 18196356 + ... + 27812795.

It is an arithmetic number, because the mean of its divisors is an integer number (6513423630336).

Almost surely, 2^{221222120021220} is an apocalyptic number.

221222120021220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221222120021220 is an abundant number, since it is smaller than the sum of its proper divisors (404066548491036).

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

221222120021220 is a wasteful number, since it uses less digits than its factorization.

221222120021220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46009921 (or 46009919 counting only the distinct ones).

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

Adding to 221222120021220 its reverse (22120021222122), we get a palindrome (243342141243342).

The spelling of 221222120021220 in words is "two hundred twenty-one trillion, two hundred twenty-two billion, one hundred twenty million, twenty-one thousand, two hundred twenty".