23215213123 has 4 divisors (see below), whose sum is σ = 23230029760. Its totient is φ = 23200396488.

The previous prime is 23215213057. The next prime is 23215213127. The reversal of 23215213123 is 32131251232.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23215213123 is a prime.

It is a super-2 number, since 2×23215213123² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23215213127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7405968 + ... + 7409101.

It is an arithmetic number, because the mean of its divisors is an integer number (5807507440).

Almost surely, 2^23215213123 is an apocalyptic number.

23215213123 is a deficient number, since it is larger than the sum of its proper divisors (14816637).

23215213123 is a wasteful number, since it uses less digits than its factorization.

23215213123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14816636.

The product of its digits is 2160, while the sum is 25.

Adding to 23215213123 its reverse (32131251232), we get a palindrome (55346464355).

The spelling of 23215213123 in words is "twenty-three billion, two hundred fifteen million, two hundred thirteen thousand, one hundred twenty-three".