221231223123 has 16 divisors (see below), whose sum is σ = 298129147680. Its totient is φ = 145911545856.

The previous prime is 221231223097. The next prime is 221231223127. The reversal of 221231223123 is 321322132122.

It is not a de Polignac number, because 221231223123 - 2⁸ = 221231222867 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221231223093 and 221231223102.

It is not an unprimeable number, because it can be changed into a prime (221231223127) 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, 630123 + ... + 916251.

It is an arithmetic number, because the mean of its divisors is an integer number (18633071730).

Almost surely, 2^221231223123 is an apocalyptic number.

221231223123 is a deficient number, since it is larger than the sum of its proper divisors (76897924557).

221231223123 is a wasteful number, since it uses less digits than its factorization.

221231223123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 288886.

The product of its digits is 1728, while the sum is 24.

Adding to 221231223123 its reverse (321322132122), we get a palindrome (542553355245).

The spelling of 221231223123 in words is "two hundred twenty-one billion, two hundred thirty-one million, two hundred twenty-three thousand, one hundred twenty-three".