221230123 has 4 divisors (see below), whose sum is σ = 230848848. Its totient is φ = 211611400.

The previous prime is 221230073. The next prime is 221230127. The reversal of 221230123 is 321032122.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 221230123 - 2²¹ = 219132971 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221230097 and 221230106.

It is not an unprimeable number, because it can be changed into a prime (221230127) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4809328 + ... + 4809373.

It is an arithmetic number, because the mean of its divisors is an integer number (57712212).

Almost surely, 2^221230123 is an apocalyptic number.

221230123 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

221230123 is a deficient number, since it is larger than the sum of its proper divisors (9618725).

221230123 is an equidigital number, since it uses as much as digits as its factorization.

221230123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9618724.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 221230123 is about 14873.8066075904. The cubic root of 221230123 is about 604.8041375865.

Adding to 221230123 its reverse (321032122), we get a palindrome (542262245).

The spelling of 221230123 in words is "two hundred twenty-one million, two hundred thirty thousand, one hundred twenty-three".