221031212 has 12 divisors (see below), whose sum is σ = 409557960. Its totient is φ = 104014656.

The previous prime is 221031211. The next prime is 221031247. The reversal of 221031212 is 212130122.

It is a happy number.

221031212 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (221031211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1625162 + ... + 1625297.

It is an arithmetic number, because the mean of its divisors is an integer number (34129830).

Almost surely, 2^221031212 is an apocalyptic number.

It is an amenable number.

221031212 is a deficient number, since it is larger than the sum of its proper divisors (188526748).

221031212 is a wasteful number, since it uses less digits than its factorization.

221031212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3250480 (or 3250478 counting only the distinct ones).

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

The square root of 221031212 is about 14867.1184834184. The cubic root of 221031212 is about 604.6228207036.

Adding to 221031212 its reverse (212130122), we get a palindrome (433161334).

The spelling of 221031212 in words is "two hundred twenty-one million, thirty-one thousand, two hundred twelve".