222111222220221 has 16 divisors (see below), whose sum is σ = 296189771539200. Its totient is φ = 148053411455040.

The previous prime is 222111222220219. The next prime is 222111222220259. The reversal of 222111222220221 is 122022222111222.

It is a happy number.

It is not a de Polignac number, because 222111222220221 - 2¹ = 222111222220219 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 222111222220191 and 222111222220200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222111222220421) 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, 1259524171 + ... + 1259700503.

It is an arithmetic number, because the mean of its divisors is an integer number (18511860721200).

Almost surely, 2^{222111222220221} is an apocalyptic number.

It is an amenable number.

222111222220221 is a deficient number, since it is larger than the sum of its proper divisors (74078549318979).

222111222220221 is a wasteful number, since it uses less digits than its factorization.

222111222220221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 232756.

The product of its (nonzero) digits is 1024, while the sum is 24.

Adding to 222111222220221 its reverse (122022222111222), we get a palindrome (344133444331443).

The spelling of 222111222220221 in words is "two hundred twenty-two trillion, one hundred eleven billion, two hundred twenty-two million, two hundred twenty thousand, two hundred twenty-one".