221312012 has 24 divisors (see below), whose sum is σ = 390650400. Its totient is φ = 109702656.

The previous prime is 221312011. The next prime is 221312023. The reversal of 221312012 is 210213122.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (221312011) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 328508 + ... + 329180.

It is an arithmetic number, because the mean of its divisors is an integer number (16277100).

Almost surely, 2^221312012 is an apocalyptic number.

It is an amenable number.

221312012 is a deficient number, since it is larger than the sum of its proper divisors (169338388).

221312012 is a wasteful number, since it uses less digits than its factorization.

221312012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1265 (or 1263 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 221312012 is about 14876.5591451787. The cubic root of 221312012 is about 604.8787517421.

Adding to 221312012 its reverse (210213122), we get a palindrome (431525134).

The spelling of 221312012 in words is "two hundred twenty-one million, three hundred twelve thousand, twelve".