213023431231 has 4 divisors (see below), whose sum is σ = 229409849032. Its totient is φ = 196637013432.

The previous prime is 213023431193. The next prime is 213023431249. The reversal of 213023431231 is 132134320312.

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

It is a cyclic number.

It is not a de Polignac number, because 213023431231 - 2¹⁵ = 213023398463 is a prime.

It is a super-2 number, since 2×213023431231² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 213023431196 and 213023431205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213023431261) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8193208881 + ... + 8193208906.

It is an arithmetic number, because the mean of its divisors is an integer number (57352462258).

Almost surely, 2^213023431231 is an apocalyptic number.

213023431231 is a deficient number, since it is larger than the sum of its proper divisors (16386417801).

213023431231 is a wasteful number, since it uses less digits than its factorization.

213023431231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16386417800.

The product of its (nonzero) digits is 2592, while the sum is 25.

Adding to 213023431231 its reverse (132134320312), we get a palindrome (345157751543).

The spelling of 213023431231 in words is "two hundred thirteen billion, twenty-three million, four hundred thirty-one thousand, two hundred thirty-one".