231021213423 has 64 divisors (see below), whose sum is σ = 424754383872. Its totient is φ = 107785313280.

The previous prime is 231021213361. The next prime is 231021213439. The reversal of 231021213423 is 324312120132.

It is not a de Polignac number, because 231021213423 - 2¹⁴ = 231021197039 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 231021213393 and 231021213402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231021213443) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 928486 + ... + 1150707.

It is an arithmetic number, because the mean of its divisors is an integer number (6636787248).

Almost surely, 2^231021213423 is an apocalyptic number.

231021213423 is a deficient number, since it is larger than the sum of its proper divisors (193733170449).

231021213423 is a wasteful number, since it uses less digits than its factorization.

231021213423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2079264.

The product of its (nonzero) digits is 1728, while the sum is 24.

Adding to 231021213423 its reverse (324312120132), we get a palindrome (555333333555).

It can be divided in two parts, 231021 and 213423, that added together give a palindrome (444444).

The spelling of 231021213423 in words is "two hundred thirty-one billion, twenty-one million, two hundred thirteen thousand, four hundred twenty-three".