213231321123 has 16 divisors (see below), whose sum is σ = 292348219296. Its totient is φ = 138143681280.

The previous prime is 213231321101. The next prime is 213231321157. The reversal of 213231321123 is 321123132312.

It is not a de Polignac number, because 213231321123 - 2³³ = 204641386531 is a prime.

It is a super-2 number, since 2×213231321123² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 213231321093 and 213231321102.

It is not an unprimeable number, because it can be changed into a prime (213231322123) 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, 1078786 + ... + 1261047.

It is an arithmetic number, because the mean of its divisors is an integer number (18271763706).

Almost surely, 2^213231321123 is an apocalyptic number.

213231321123 is a deficient number, since it is larger than the sum of its proper divisors (79116898173).

213231321123 is a wasteful number, since it uses less digits than its factorization.

213231321123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2340694.

The product of its digits is 1296, while the sum is 24.

Adding to 213231321123 its reverse (321123132312), we get a palindrome (534354453435).

The spelling of 213231321123 in words is "two hundred thirteen billion, two hundred thirty-one million, three hundred twenty-one thousand, one hundred twenty-three".