221030223123 has 16 divisors (see below), whose sum is σ = 307959065856. Its totient is φ = 140745712800.

The previous prime is 221030223119. The next prime is 221030223131. The reversal of 221030223123 is 321322030122.

It is a happy number.

It is not a de Polignac number, because 221030223123 - 2² = 221030223119 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 221030223123.

It is not an unprimeable number, because it can be changed into a prime (221030223023) 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, 2236465 + ... + 2333202.

It is an arithmetic number, because the mean of its divisors is an integer number (19247441616).

Almost surely, 2^221030223123 is an apocalyptic number.

221030223123 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

221030223123 is a deficient number, since it is larger than the sum of its proper divisors (86928842733).

221030223123 is a wasteful number, since it uses less digits than its factorization.

221030223123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4570394.

The product of its (nonzero) digits is 864, while the sum is 21.

Adding to 221030223123 its reverse (321322030122), we get a palindrome (542352253245).

It can be divided in two parts, 221030 and 223123, that added together give a triangular number (444153 = T₉₄₂).

The spelling of 221030223123 in words is "two hundred twenty-one billion, thirty million, two hundred twenty-three thousand, one hundred twenty-three".