221232123 has 48 divisors (see below), whose sum is σ = 378743040. Its totient is φ = 121822272.

The previous prime is 221232113. The next prime is 221232127. The reversal of 221232123 is 321232122.

It is not a de Polignac number, because 221232123 - 2⁶ = 221232059 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221232096 and 221232105.

It is not an unprimeable number, because it can be changed into a prime (221232127) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 196440 + ... + 197562.

It is an arithmetic number, because the mean of its divisors is an integer number (7890480).

Almost surely, 2^221232123 is an apocalyptic number.

221232123 is a deficient number, since it is larger than the sum of its proper divisors (157510917).

221232123 is a wasteful number, since it uses less digits than its factorization.

221232123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1248 (or 1245 counting only the distinct ones).

The product of its digits is 288, while the sum is 18.

The square root of 221232123 is about 14873.8738397231. The cubic root of 221232123 is about 604.8059601301.

Adding to 221232123 its reverse (321232122), we get a palindrome (542464245).

Subtracting 221232123 from its reverse (321232122), we obtain a palindrome (99999999).

The spelling of 221232123 in words is "two hundred twenty-one million, two hundred thirty-two thousand, one hundred twenty-three".