1231404321 has 8 divisors (see below), whose sum is σ = 1876425664. Its totient is φ = 703659600.

The previous prime is 1231404311. The next prime is 1231404329. The reversal of 1231404321 is 1234041321.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1231404321 - 2¹⁷ = 1231273249 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 58638301 = 1231404321 / (1 + 2 + 3 + 1 + 4 + 0 + 4 + 3 + 2 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1231404329) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29319130 + ... + 29319171.

It is an arithmetic number, because the mean of its divisors is an integer number (234553208).

Almost surely, 2^1231404321 is an apocalyptic number.

It is an amenable number.

1231404321 is a deficient number, since it is larger than the sum of its proper divisors (645021343).

1231404321 is an equidigital number, since it uses as much as digits as its factorization.

1231404321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58638311.

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 1231404321 is about 35091.3710333466. The cubic root of 1231404321 is about 1071.8488781480.

Adding to 1231404321 its reverse (1234041321), we get a palindrome (2465445642).

The spelling of 1231404321 in words is "one billion, two hundred thirty-one million, four hundred four thousand, three hundred twenty-one".