1321232004 has 18 divisors (see below), whose sum is σ = 3339780990. Its totient is φ = 440410656.

The previous prime is 1321231979. The next prime is 1321232009. The reversal of 1321232004 is 4002321231.

It can be written as a sum of positive squares in only one way, i.e., 1260392004 + 60840000 = 35502^2 + 7800^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (1321232009) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 18350409 + ... + 18350480.

Almost surely, 2^1321232004 is an apocalyptic number.

It is an amenable number.

1321232004 is an abundant number, since it is smaller than the sum of its proper divisors (2018548986).

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

1321232004 is a wasteful number, since it uses less digits than its factorization.

1321232004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36700899 (or 36700894 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 1321232004 is about 36348.7551918907. The cubic root of 1321232004 is about 1097.3024823260.

Adding to 1321232004 its reverse (4002321231), we get a palindrome (5323553235).

The spelling of 1321232004 in words is "one billion, three hundred twenty-one million, two hundred thirty-two thousand, four".