222220220000221 has 4 divisors (see below), whose sum is σ = 222220249933500. Its totient is φ = 222220190066944.

The previous prime is 222220220000201. The next prime is 222220220000257. The reversal of 222220220000221 is 122000022022222.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 127235918412100 + 94984301588121 = 11279890^2 + 9745989^2 .

It is a cyclic number.

It is not a de Polignac number, because 222220220000221 - 2²³ = 222220211611613 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 (222220220000201) 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, 5482035 + ... + 21782863.

It is an arithmetic number, because the mean of its divisors is an integer number (55555062483375).

Almost surely, 2^{222220220000221} is an apocalyptic number.

It is an amenable number.

222220220000221 is a deficient number, since it is larger than the sum of its proper divisors (29933279).

222220220000221 is a wasteful number, since it uses less digits than its factorization.

222220220000221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29933278.

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

Adding to 222220220000221 its reverse (122000022022222), we get a palindrome (344220242022443).

The spelling of 222220220000221 in words is "two hundred twenty-two trillion, two hundred twenty billion, two hundred twenty million, two hundred twenty-one", and thus it is an aban number.