222212210021221 has 16 divisors (see below), whose sum is σ = 259988748079104. Its totient is φ = 185947950356784.

The previous prime is 222212210021201. The next prime is 222212210021227. The reversal of 222212210021221 is 122120012212222.

It is not a de Polignac number, because 222212210021221 - 2⁵ = 222212210021189 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 222212210021192 and 222212210021201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222212210021227) 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, 178304521 + ... + 179546446.

It is an arithmetic number, because the mean of its divisors is an integer number (16249296754944).

Almost surely, 2^{222212210021221} is an apocalyptic number.

It is an amenable number.

222212210021221 is a deficient number, since it is larger than the sum of its proper divisors (37776538057883).

222212210021221 is a wasteful number, since it uses less digits than its factorization.

222212210021221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 357853080.

The product of its (nonzero) digits is 512, while the sum is 22.

Adding to 222212210021221 its reverse (122120012212222), we get a palindrome (344332222233443).

The spelling of 222212210021221 in words is "two hundred twenty-two trillion, two hundred twelve billion, two hundred ten million, twenty-one thousand, two hundred twenty-one".