1231221123223 has 16 divisors (see below), whose sum is σ = 1525384516096. Its totient is φ = 967701621600.

The previous prime is 1231221123199. The next prime is 1231221123227. The reversal of 1231221123223 is 3223211221321.

It is not a de Polignac number, because 1231221123223 - 2²⁹ = 1230684252311 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231221123227) 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, 44787261 + ... + 44814742.

It is an arithmetic number, because the mean of its divisors is an integer number (95336532256).

Almost surely, 2^{1231221123223} is an apocalyptic number.

1231221123223 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1231221123223 is a deficient number, since it is larger than the sum of its proper divisors (294163392873).

1231221123223 is a wasteful number, since it uses less digits than its factorization.

1231221123223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89602174.

The product of its digits is 1728, while the sum is 25.

Adding to 1231221123223 its reverse (3223211221321), we get a palindrome (4454432344544).

The spelling of 1231221123223 in words is "one trillion, two hundred thirty-one billion, two hundred twenty-one million, one hundred twenty-three thousand, two hundred twenty-three".