221221000002222 has 48 divisors (see below), whose sum is σ = 537018054077232. Its totient is φ = 65224864863360.

The previous prime is 221221000002221. The next prime is 221221000002241. The reversal of 221221000002222 is 222200000122122.

221221000002222 is a `hidden beast` number, since 221 + 221 + 0 + 0 + 0 + 0 + 0 + 2 + 222 = 666.

It is a super-2 number, since 2×221221000002222² (a number of 29 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 221221000002195 and 221221000002204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221221000002221) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15098341023 + ... + 15098355674.

It is an arithmetic number, because the mean of its divisors is an integer number (11187876126609).

Almost surely, 2^{221221000002222} is an apocalyptic number.

221221000002222 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

221221000002222 is an abundant number, since it is smaller than the sum of its proper divisors (315797054075010).

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

221221000002222 is a wasteful number, since it uses less digits than its factorization.

221221000002222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30196696753 (or 30196696750 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

Adding to 221221000002222 its reverse (222200000122122), we get a palindrome (443421000124344).

The spelling of 221221000002222 in words is "two hundred twenty-one trillion, two hundred twenty-one billion, two thousand, two hundred twenty-two".