221221212222 has 64 divisors (see below), whose sum is σ = 460224737280. Its totient is φ = 70841971200.

The previous prime is 221221212187. The next prime is 221221212257. The reversal of 221221212222 is 222212122122.

221221212222 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (221221212187) and next prime (221221212257).

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 31 ways as a sum of consecutive naturals, for example, 4360522 + ... + 4410962.

It is an arithmetic number, because the mean of its divisors is an integer number (7191011520).

Almost surely, 2^221221212222 is an apocalyptic number.

221221212222 is an abundant number, since it is smaller than the sum of its proper divisors (239003525058).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221221212222 is a wasteful number, since it uses less digits than its factorization.

221221212222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50769.

The product of its digits is 512, while the sum is 21.

Adding to 221221212222 its reverse (222212122122), we get a palindrome (443433334344).

The spelling of 221221212222 in words is "two hundred twenty-one billion, two hundred twenty-one million, two hundred twelve thousand, two hundred twenty-two".