222120111022221 has 16 divisors (see below), whose sum is σ = 296360808506048. Its totient is φ = 147979761321600.

The previous prime is 222120111022217. The next prime is 222120111022241. The reversal of 222120111022221 is 122220111021222.

It is not a de Polignac number, because 222120111022221 - 2² = 222120111022217 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 (222120111022241) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 48585390 + ... + 52960176.

It is an arithmetic number, because the mean of its divisors is an integer number (18522550531628).

Almost surely, 2^{222120111022221} is an apocalyptic number.

It is an amenable number.

222120111022221 is a deficient number, since it is larger than the sum of its proper divisors (74240697483827).

222120111022221 is a wasteful number, since it uses less digits than its factorization.

222120111022221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4386252.

The product of its (nonzero) digits is 256, while the sum is 21.

Adding to 222120111022221 its reverse (122220111021222), we get a palindrome (344340222043443).

Subtracting from 222120111022221 its reverse (122220111021222), we obtain a palindrome (99900000000999).

The spelling of 222120111022221 in words is "two hundred twenty-two trillion, one hundred twenty billion, one hundred eleven million, twenty-two thousand, two hundred twenty-one".