222222220021 has 4 divisors (see below), whose sum is σ = 223637648332. Its totient is φ = 220806791712.

The previous prime is 222222220009. The next prime is 222222220037. The reversal of 222222220021 is 120022222222.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 31938693796 + 190283526225 = 178714^2 + 436215^2 .

It is a cyclic number.

It is not a de Polignac number, because 222222220021 - 2¹³ = 222222211829 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222222220921) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 707713920 + ... + 707714233.

It is an arithmetic number, because the mean of its divisors is an integer number (55909412083).

Almost surely, 2^222222220021 is an apocalyptic number.

It is an amenable number.

222222220021 is a deficient number, since it is larger than the sum of its proper divisors (1415428311).

222222220021 is a wasteful number, since it uses less digits than its factorization.

222222220021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1415428310.

The product of its (nonzero) digits is 512, while the sum is 19.

Adding to 222222220021 its reverse (120022222222), we get a palindrome (342244442243).

The spelling of 222222220021 in words is "two hundred twenty-two billion, two hundred twenty-two million, two hundred twenty thousand, twenty-one".