221211222212 has 24 divisors (see below), whose sum is σ = 409922656416. Its totient is φ = 104091456128.

The previous prime is 221211222179. The next prime is 221211222217. The reversal of 221211222212 is 212222112122.

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

It is not an unprimeable number, because it can be changed into a prime (221211222217) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 826883 + ... + 1061205.

It is an arithmetic number, because the mean of its divisors is an integer number (17080110684).

Almost surely, 2^221211222212 is an apocalyptic number.

It is an amenable number.

221211222212 is a deficient number, since it is larger than the sum of its proper divisors (188711434204).

221211222212 is a wasteful number, since it uses less digits than its factorization.

221211222212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 248227 (or 248225 counting only the distinct ones).

The product of its digits is 256, while the sum is 20.

Adding to 221211222212 its reverse (212222112122), we get a palindrome (433433334334).

The spelling of 221211222212 in words is "two hundred twenty-one billion, two hundred eleven million, two hundred twenty-two thousand, two hundred twelve".