1221023404 has 24 divisors (see below), whose sum is σ = 2177050400. Its totient is φ = 599094144.

The previous prime is 1221023393. The next prime is 1221023411. The reversal of 1221023404 is 4043201221.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47602 + ... + 68614.

Almost surely, 2^1221023404 is an apocalyptic number.

It is an amenable number.

1221023404 is a deficient number, since it is larger than the sum of its proper divisors (956026996).

1221023404 is a wasteful number, since it uses less digits than its factorization.

1221023404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21289 (or 21287 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 1221023404 is about 34943.1453077710. The cubic root of 1221023404 is about 1068.8284274082.

Adding to 1221023404 its reverse (4043201221), we get a palindrome (5264224625).

The spelling of 1221023404 in words is "one billion, two hundred twenty-one million, twenty-three thousand, four hundred four".