222220221021 has 12 divisors (see below), whose sum is σ = 320999541148. Its totient is φ = 148139993664.

The previous prime is 222220221011. The next prime is 222220221073. The reversal of 222220221021 is 120122022222.

222220221021 is a `hidden beast` number, since 222 + 220 + 221 + 0 + 2 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 95690616921 + 126529604100 = 309339^2 + 355710^2 .

It is not a de Polignac number, because 222220221021 - 2¹⁹ = 222219696733 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 222220220985 and 222220221003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222220221011) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 357910 + ... + 756663.

Almost surely, 2^222220221021 is an apocalyptic number.

It is an amenable number.

222220221021 is a deficient number, since it is larger than the sum of its proper divisors (98779320127).

222220221021 is a wasteful number, since it uses less digits than its factorization.

222220221021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1136732 (or 1136729 counting only the distinct ones).

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

Adding to 222220221021 its reverse (120122022222), we get a palindrome (342342243243).

The spelling of 222220221021 in words is "two hundred twenty-two billion, two hundred twenty million, two hundred twenty-one thousand, twenty-one".