1221233212 has 24 divisors (see below), whose sum is σ = 2175894000. Its totient is φ = 599573376.

The previous prime is 1221233183. The next prime is 1221233219. The reversal of 1221233212 is 2123321221.

It is a self number, because there is not a number n which added to its sum of digits gives 1221233212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221233219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 245098 + ... + 250030.

It is an arithmetic number, because the mean of its divisors is an integer number (90662250).

Almost surely, 2^1221233212 is an apocalyptic number.

It is an amenable number.

1221233212 is a deficient number, since it is larger than the sum of its proper divisors (954660788).

1221233212 is a wasteful number, since it uses less digits than its factorization.

1221233212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6045 (or 6043 counting only the distinct ones).

The product of its digits is 288, while the sum is 19.

The square root of 1221233212 is about 34946.1473126867. The cubic root of 1221233212 is about 1068.8896426999.

Adding to 1221233212 its reverse (2123321221), we get a palindrome (3344554433).

The spelling of 1221233212 in words is "one billion, two hundred twenty-one million, two hundred thirty-three thousand, two hundred twelve".