221233231212 has 24 divisors (see below), whose sum is σ = 589955283456. Its totient is φ = 63209494608.

The previous prime is 221233231169. The next prime is 221233231223. The reversal of 221233231212 is 212132332122.

It is a nude number because it is divisible by every one of its digits.

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, 1316864388 + ... + 1316864555.

It is an arithmetic number, because the mean of its divisors is an integer number (24581470144).

Almost surely, 2^221233231212 is an apocalyptic number.

It is an amenable number.

221233231212 is an abundant number, since it is smaller than the sum of its proper divisors (368722052244).

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

221233231212 is a wasteful number, since it uses less digits than its factorization.

221233231212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2633728957 (or 2633728955 counting only the distinct ones).

The product of its digits is 1728, while the sum is 24.

Adding to 221233231212 its reverse (212132332122), we get a palindrome (433365563334).

The spelling of 221233231212 in words is "two hundred twenty-one billion, two hundred thirty-three million, two hundred thirty-one thousand, two hundred twelve".