221331203212 has 24 divisors (see below), whose sum is σ = 452956883456. Its totient is φ = 92650270608.

The previous prime is 221331203111. The next prime is 221331203221. The reversal of 221331203212 is 212302133122.

221331203212 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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, 91913748 + ... + 91916155.

Almost surely, 2^221331203212 is an apocalyptic number.

It is an amenable number.

221331203212 is an abundant number, since it is smaller than the sum of its proper divisors (231625680244).

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

221331203212 is a wasteful number, since it uses less digits than its factorization.

221331203212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 183829957 (or 183829955 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 22.

Adding to 221331203212 its reverse (212302133122), we get a palindrome (433633336334).

The spelling of 221331203212 in words is "two hundred twenty-one billion, three hundred thirty-one million, two hundred three thousand, two hundred twelve".