1231303021321 has 4 divisors (see below), whose sum is σ = 1231305956992. Its totient is φ = 1231300085652.

The previous prime is 1231303021303. The next prime is 1231303021327. The reversal of 1231303021321 is 1231203031321.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1231303021321 - 2³³ = 1222713086729 is a prime.

It is a super-2 number, since 2×1231303021321² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1231303021292 and 1231303021301.

It is not an unprimeable number, because it can be changed into a prime (1231303021327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 707361 + ... + 1721326.

It is an arithmetic number, because the mean of its divisors is an integer number (307826489248).

Almost surely, 2^{1231303021321} is an apocalyptic number.

It is an amenable number.

1231303021321 is a deficient number, since it is larger than the sum of its proper divisors (2935671).

1231303021321 is an equidigital number, since it uses as much as digits as its factorization.

1231303021321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2935670.

The product of its (nonzero) digits is 648, while the sum is 22.

Adding to 1231303021321 its reverse (1231203031321), we get a palindrome (2462506052642).

The spelling of 1231303021321 in words is "one trillion, two hundred thirty-one billion, three hundred three million, twenty-one thousand, three hundred twenty-one".