221311312212 has 24 divisors (see below), whose sum is σ = 516408846912. Its totient is φ = 73768182400.

The previous prime is 221311312063. The next prime is 221311312223. The reversal of 221311312212 is 212213113122.

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 7 ways as a sum of consecutive naturals, for example, 154012 + ... + 682892.

It is an arithmetic number, because the mean of its divisors is an integer number (21517035288).

Almost surely, 2^221311312212 is an apocalyptic number.

It is an amenable number.

221311312212 is an abundant number, since it is smaller than the sum of its proper divisors (295097534700).

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

221311312212 is a wasteful number, since it uses less digits than its factorization.

221311312212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 563759 (or 563757 counting only the distinct ones).

The product of its digits is 288, while the sum is 21.

Adding to 221311312212 its reverse (212213113122), we get a palindrome (433524425334).

The spelling of 221311312212 in words is "two hundred twenty-one billion, three hundred eleven million, three hundred twelve thousand, two hundred twelve".