221211112221212 has 12 divisors (see below), whose sum is σ = 392019692544480. Its totient is φ = 109205485779936.

The previous prime is 221211112221179. The next prime is 221211112221221. The reversal of 221211112221212 is 212122211112122.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 350017582313 + ... + 350017582944.

It is an arithmetic number, because the mean of its divisors is an integer number (32668307712040).

Almost surely, 2^{221211112221212} is an apocalyptic number.

It is an amenable number.

221211112221212 is a deficient number, since it is larger than the sum of its proper divisors (170808580323268).

221211112221212 is a wasteful number, since it uses less digits than its factorization.

221211112221212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 700035165340 (or 700035165338 counting only the distinct ones).

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

Adding to 221211112221212 its reverse (212122211112122), we get a palindrome (433333323333334).

The spelling of 221211112221212 in words is "two hundred twenty-one trillion, two hundred eleven billion, one hundred twelve million, two hundred twenty-one thousand, two hundred twelve".