221230321212 has 24 divisors (see below), whose sum is σ = 525943784016. Its totient is φ = 72352054528.

The previous prime is 221230321211. The next prime is 221230321259. The reversal of 221230321212 is 212123032122.

221230321212 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221230321211) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 173922573 + ... + 173923844.

It is an arithmetic number, because the mean of its divisors is an integer number (21914324334).

Almost surely, 2^221230321212 is an apocalyptic number.

It is an amenable number.

221230321212 is an abundant number, since it is smaller than the sum of its proper divisors (304713462804).

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

221230321212 is a wasteful number, since it uses less digits than its factorization.

221230321212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 347846477 (or 347846475 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 221230321212 its reverse (212123032122), we get a palindrome (433353353334).

The spelling of 221230321212 in words is "two hundred twenty-one billion, two hundred thirty million, three hundred twenty-one thousand, two hundred twelve".