222122011221 has 36 divisors (see below), whose sum is σ = 357493150924. Its totient is φ = 132775251840.

The previous prime is 222122011217. The next prime is 222122011231. The reversal of 222122011221 is 122110221222.

It is a happy number.

222122011221 is a `hidden beast` number, since 2 + 221 + 220 + 1 + 1 + 221 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 109554380100 + 112567631121 = 330990^2 + 335511^2 .

It is not a de Polignac number, because 222122011221 - 2² = 222122011217 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 222122011194 and 222122011203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222122011231) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1317550 + ... + 1476543.

Almost surely, 2^222122011221 is an apocalyptic number.

It is an amenable number.

222122011221 is a deficient number, since it is larger than the sum of its proper divisors (135371139703).

222122011221 is a wasteful number, since it uses less digits than its factorization.

222122011221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2794194 (or 2794180 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 222122011221 its reverse (122110221222), we get a palindrome (344232232443).

The spelling of 222122011221 in words is "two hundred twenty-two billion, one hundred twenty-two million, eleven thousand, two hundred twenty-one".