1231000223321 has 4 divisors (see below), whose sum is σ = 1342909334544. Its totient is φ = 1119091112100.

The previous prime is 1231000223281. The next prime is 1231000223339. The reversal of 1231000223321 is 1233220001321.

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 1231000223321 - 2¹⁰ = 1231000222297 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1231000223293 and 1231000223302.

It is not an unprimeable number, because it can be changed into a prime (1231000223521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55954555595 + ... + 55954555616.

It is an arithmetic number, because the mean of its divisors is an integer number (335727333636).

Almost surely, 2^{1231000223321} is an apocalyptic number.

1231000223321 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1231000223321 is a deficient number, since it is larger than the sum of its proper divisors (111909111223).

1231000223321 is a wasteful number, since it uses less digits than its factorization.

1231000223321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111909111222.

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 1231000223321 its reverse (1233220001321), we get a palindrome (2464220224642).

The spelling of 1231000223321 in words is "one trillion, two hundred thirty-one billion, two hundred twenty-three thousand, three hundred twenty-one".