1221223232 has 14 divisors (see below), whose sum is σ = 2423364978. Its totient is φ = 610611584.

The previous prime is 1221223229. The next prime is 1221223301. The reversal of 1221223232 is 2323221221.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1105961536 + 115261696 = 33256^2 + 10736^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9540743 + ... + 9540870.

Almost surely, 2^1221223232 is an apocalyptic number.

It is an amenable number.

1221223232 is a deficient number, since it is larger than the sum of its proper divisors (1202141746).

1221223232 is an equidigital number, since it uses as much as digits as its factorization.

1221223232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19081625 (or 19081615 counting only the distinct ones).

The product of its digits is 576, while the sum is 20.

The square root of 1221223232 is about 34946.0045212611. The cubic root of 1221223232 is about 1068.8867310126.

Adding to 1221223232 its reverse (2323221221), we get a palindrome (3544444453).

The spelling of 1221223232 in words is "one billion, two hundred twenty-one million, two hundred twenty-three thousand, two hundred thirty-two".