221213212112 has 20 divisors (see below), whose sum is σ = 447235407840. Its totient is φ = 105797623008.

The previous prime is 221213212097. The next prime is 221213212127. The reversal of 221213212112 is 211212312122.

221213212112 is digitally balanced in base 2, 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 (221213212097) and next prime (221213212127).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 300561062 + ... + 300561797.

It is an arithmetic number, because the mean of its divisors is an integer number (22361770392).

Almost surely, 2^221213212112 is an apocalyptic number.

It is an amenable number.

221213212112 is an abundant number, since it is smaller than the sum of its proper divisors (226022195728).

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

221213212112 is a wasteful number, since it uses less digits than its factorization.

221213212112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 601122890 (or 601122884 counting only the distinct ones).

The product of its digits is 192, while the sum is 20.

Adding to 221213212112 its reverse (211212312122), we get a palindrome (432425524234).

The spelling of 221213212112 in words is "two hundred twenty-one billion, two hundred thirteen million, two hundred twelve thousand, one hundred twelve".