213231031131 has 16 divisors (see below), whose sum is σ = 312283434240. Its totient is φ = 128816915040.

The previous prime is 213231031073. The next prime is 213231031147. The reversal of 213231031131 is 131130132312.

It is a happy number.

It is not a de Polignac number, because 213231031131 - 2⁹ = 213231030619 is a prime.

It is a super-2 number, since 2×213231031131² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 213231031098 and 213231031107.

It is not an unprimeable number, because it can be changed into a prime (213231031831) 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, 81322500 + ... + 81325121.

It is an arithmetic number, because the mean of its divisors is an integer number (19517714640).

Almost surely, 2^213231031131 is an apocalyptic number.

213231031131 is a deficient number, since it is larger than the sum of its proper divisors (99052403109).

213231031131 is a wasteful number, since it uses less digits than its factorization.

213231031131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162647666.

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

Adding to 213231031131 its reverse (131130132312), we get a palindrome (344361163443).

The spelling of 213231031131 in words is "two hundred thirteen billion, two hundred thirty-one million, thirty-one thousand, one hundred thirty-one".