213113031231 has 16 divisors (see below), whose sum is σ = 284745517056. Its totient is φ = 141778259616.

The previous prime is 213113031199. The next prime is 213113031233. The reversal of 213113031231 is 132130311312.

It is a happy number.

It is not a de Polignac number, because 213113031231 - 2⁵ = 213113031199 is a prime.

It is a super-2 number, since 2×213113031231² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 213113031198 and 213113031207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213113031233) 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, 2784826 + ... + 2860328.

It is an arithmetic number, because the mean of its divisors is an integer number (17796594816).

Almost surely, 2^213113031231 is an apocalyptic number.

213113031231 is a deficient number, since it is larger than the sum of its proper divisors (71632485825).

213113031231 is a wasteful number, since it uses less digits than its factorization.

213113031231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77462.

The product of its (nonzero) digits is 324, while the sum is 21.

Adding to 213113031231 its reverse (132130311312), we get a palindrome (345243342543).

The spelling of 213113031231 in words is "two hundred thirteen billion, one hundred thirteen million, thirty-one thousand, two hundred thirty-one".