222002221221 has 144 divisors (see below), whose sum is σ = 370874649600. Its totient is φ = 127742883840.

The previous prime is 222002221219. The next prime is 222002221223. The reversal of 222002221221 is 122122200222.

222002221221 is a `hidden beast` number, since 2 + 220 + 0 + 2 + 221 + 221 = 666.

It is an interprime number because it is at equal distance from previous prime (222002221219) and next prime (222002221223).

It is not a de Polignac number, because 222002221221 - 2¹ = 222002221219 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 222002221194 and 222002221203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222002221223) by changing a digit.

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 143 ways as a sum of consecutive naturals, for example, 308764900 + ... + 308765618.

It is an arithmetic number, because the mean of its divisors is an integer number (2575518400).

Almost surely, 2^222002221221 is an apocalyptic number.

It is an amenable number.

222002221221 is a deficient number, since it is larger than the sum of its proper divisors (148872428379).

222002221221 is a wasteful number, since it uses less digits than its factorization.

222002221221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 960 (or 946 counting only the distinct ones).

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

Adding to 222002221221 its reverse (122122200222), we get a palindrome (344124421443).

The spelling of 222002221221 in words is "two hundred twenty-two billion, two million, two hundred twenty-one thousand, two hundred twenty-one".