221211112222112 has 12 divisors (see below), whose sum is σ = 435509377187346. Its totient is φ = 110605556111040.

The previous prime is 221211112222103. The next prime is 221211112222129. The reversal of 221211112222112 is 211222211112122.

It can be written as a sum of positive squares in only one way, i.e., 153430733264656 + 67780378957456 = 12386716^2 + 8232884^2 .

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3456423628439 + ... + 3456423628502.

Almost surely, 2^{221211112222112} is an apocalyptic number.

It is an amenable number.

221211112222112 is a deficient number, since it is larger than the sum of its proper divisors (214298264965234).

221211112222112 is an equidigital number, since it uses as much as digits as its factorization.

221211112222112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6912847256951 (or 6912847256943 counting only the distinct ones).

The product of its digits is 256, while the sum is 23.

Adding to 221211112222112 its reverse (211222211112122), we get a palindrome (432433323334234).

The spelling of 221211112222112 in words is "two hundred twenty-one trillion, two hundred eleven billion, one hundred twelve million, two hundred twenty-two thousand, one hundred twelve".