1231421432321 has 16 divisors (see below), whose sum is σ = 1314886177920. Its totient is φ = 1151470235520.

The previous prime is 1231421432257. The next prime is 1231421432333. The reversal of 1231421432321 is 1232341241321.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1231421432321 - 2⁶ = 1231421432257 is a prime.

It is a super-3 number, since 3×1231421432321³ (a number of 37 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1231421432221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5956181 + ... + 6159458.

It is an arithmetic number, because the mean of its divisors is an integer number (82180386120).

Almost surely, 2^{1231421432321} is an apocalyptic number.

It is an amenable number.

1231421432321 is a deficient number, since it is larger than the sum of its proper divisors (83464745599).

1231421432321 is a wasteful number, since it uses less digits than its factorization.

1231421432321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12115784.

The product of its digits is 6912, while the sum is 29.

Adding to 1231421432321 its reverse (1232341241321), we get a palindrome (2463762673642).

The spelling of 1231421432321 in words is "one trillion, two hundred thirty-one billion, four hundred twenty-one million, four hundred thirty-two thousand, three hundred twenty-one".