1231221604 has 12 divisors (see below), whose sum is σ = 2155708800. Its totient is φ = 615304808.

The previous prime is 1231221601. The next prime is 1231221619. The reversal of 1231221604 is 4061221321.

It is not an unprimeable number, because it can be changed into a prime (1231221601) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 67324 + ... + 83635.

It is an arithmetic number, because the mean of its divisors is an integer number (179642400).

Almost surely, 2^1231221604 is an apocalyptic number.

It is an amenable number.

1231221604 is a deficient number, since it is larger than the sum of its proper divisors (924487196).

1231221604 is a wasteful number, since it uses less digits than its factorization.

1231221604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153002 (or 153000 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 1231221604 is about 35088.7674904662. The cubic root of 1231221604 is about 1071.7958615243.

Adding to 1231221604 its reverse (4061221321), we get a palindrome (5292442925).

The spelling of 1231221604 in words is "one billion, two hundred thirty-one million, two hundred twenty-one thousand, six hundred four".