421323123 has 16 divisors (see below), whose sum is σ = 607654656. Its totient is φ = 258128160.

The previous prime is 421323109. The next prime is 421323127. The reversal of 421323123 is 321323124.

It is not a de Polignac number, because 421323123 - 2⁶ = 421323059 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 421323123.

It is not an unprimeable number, because it can be changed into a prime (421323127) 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, 14943 + ... + 32648.

It is an arithmetic number, because the mean of its divisors is an integer number (37978416).

Almost surely, 2^421323123 is an apocalyptic number.

421323123 is a deficient number, since it is larger than the sum of its proper divisors (186331533).

421323123 is a wasteful number, since it uses less digits than its factorization.

421323123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47834.

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

The square root of 421323123 is about 20526.1570441230. The cubic root of 421323123 is about 749.6728190687.

Adding to 421323123 its reverse (321323124), we get a palindrome (742646247).

Subtracting from 421323123 its reverse (321323124), we obtain a palindrome (99999999).

The spelling of 421323123 in words is "four hundred twenty-one million, three hundred twenty-three thousand, one hundred twenty-three".