221312020412 has 12 divisors (see below), whose sum is σ = 442624040880. Its totient is φ = 94848008736.

The previous prime is 221312020381. The next prime is 221312020421. The reversal of 221312020412 is 214020213122.

221312020412 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3952000337 + ... + 3952000392.

It is an arithmetic number, because the mean of its divisors is an integer number (36885336740).

Almost surely, 2^221312020412 is an apocalyptic number.

It is an amenable number.

221312020412 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

221312020412 is a wasteful number, since it uses less digits than its factorization.

221312020412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7904000740 (or 7904000738 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 221312020412 its reverse (214020213122), we get a palindrome (435332233534).

The spelling of 221312020412 in words is "two hundred twenty-one billion, three hundred twelve million, twenty thousand, four hundred twelve".