1221004424 has 32 divisors (see below), whose sum is σ = 2332744920. Its totient is φ = 599026176.

The previous prime is 1221004387. The next prime is 1221004441. The reversal of 1221004424 is 4244001221.

It can be written as a sum of positive squares in 4 ways, for example, as 1088340100 + 132664324 = 32990^2 + 11518^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1221004396 and 1221004405.

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, 109742 + ... + 120354.

Almost surely, 2^1221004424 is an apocalyptic number.

It is an amenable number.

1221004424 is a deficient number, since it is larger than the sum of its proper divisors (1111740496).

1221004424 is a wasteful number, since it uses less digits than its factorization.

1221004424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10889 (or 10885 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 20.

The square root of 1221004424 is about 34942.8737226920. The cubic root of 1221004424 is about 1068.8228893028.

Adding to 1221004424 its reverse (4244001221), we get a palindrome (5465005645).

The spelling of 1221004424 in words is "one billion, two hundred twenty-one million, four thousand, four hundred twenty-four".