1221235224 has 32 divisors (see below), whose sum is σ = 3330642240. Its totient is φ = 370071200.

The previous prime is 1221235207. The next prime is 1221235231. The reversal of 1221235224 is 4225321221.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a junction number, because it is equal to n+sod(n) for n = 1221235194 and 1221235203.

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 in 7 ways as a sum of consecutive naturals, for example, 2312682 + ... + 2313209.

It is an arithmetic number, because the mean of its divisors is an integer number (104082570).

Almost surely, 2^1221235224 is an apocalyptic number.

It is an amenable number.

1221235224 is an abundant number, since it is smaller than the sum of its proper divisors (2109407016).

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

1221235224 is a wasteful number, since it uses less digits than its factorization.

1221235224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4625911 (or 4625907 counting only the distinct ones).

The product of its digits is 1920, while the sum is 24.

The square root of 1221235224 is about 34946.1760998253. The cubic root of 1221235224 is about 1068.8902297035.

Adding to 1221235224 its reverse (4225321221), we get a palindrome (5446556445).

The spelling of 1221235224 in words is "one billion, two hundred twenty-one million, two hundred thirty-five thousand, two hundred twenty-four".