1231213203123 has 8 divisors (see below), whose sum is σ = 1641625584336. Its totient is φ = 820804812000.

The previous prime is 1231213203089. The next prime is 1231213203133. The reversal of 1231213203123 is 3213023121321.

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

It is not a de Polignac number, because 1231213203123 - 2¹⁰ = 1231213202099 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1231213203093 and 1231213203102.

It is not an unprimeable number, because it can be changed into a prime (1231213203133) 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, 182368 + ... + 1579773.

It is an arithmetic number, because the mean of its divisors is an integer number (205203198042).

Almost surely, 2^{1231213203123} is an apocalyptic number.

1231213203123 is a deficient number, since it is larger than the sum of its proper divisors (410412381213).

1231213203123 is a wasteful number, since it uses less digits than its factorization.

1231213203123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1995045.

The product of its (nonzero) digits is 1296, while the sum is 24.

Adding to 1231213203123 its reverse (3213023121321), we get a palindrome (4444236324444).

The spelling of 1231213203123 in words is "one trillion, two hundred thirty-one billion, two hundred thirteen million, two hundred three thousand, one hundred twenty-three".