1221303412 has 12 divisors (see below), whose sum is σ = 2442606880. Its totient is φ = 523415736.

The previous prime is 1221303401. The next prime is 1221303439. The reversal of 1221303412 is 2143031221.

It is a happy number.

1221303412 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 1221303412.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21808962 + ... + 21809017.

Almost surely, 2^1221303412 is an apocalyptic number.

It is an amenable number.

1221303412 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

1221303412 is a wasteful number, since it uses less digits than its factorization.

1221303412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43617990 (or 43617988 counting only the distinct ones).

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

The square root of 1221303412 is about 34947.1517008182. The cubic root of 1221303412 is about 1068.9101232585.

Adding to 1221303412 its reverse (2143031221), we get a palindrome (3364334633).

The spelling of 1221303412 in words is "one billion, two hundred twenty-one million, three hundred three thousand, four hundred twelve".