213131223031 has 16 divisors (see below), whose sum is σ = 220021401600. Its totient is φ = 206349276640.

The previous prime is 213131222957. The next prime is 213131223047. The reversal of 213131223031 is 130322131312.

It is a cyclic number.

It is not a de Polignac number, because 213131223031 - 2⁹ = 213131222519 is a prime.

It is a super-2 number, since 2×213131223031² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 213131222993 and 213131223011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213131223061) 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, 1897170 + ... + 2006368.

It is an arithmetic number, because the mean of its divisors is an integer number (13751337600).

Almost surely, 2^213131223031 is an apocalyptic number.

213131223031 is a deficient number, since it is larger than the sum of its proper divisors (6890178569).

213131223031 is a wasteful number, since it uses less digits than its factorization.

213131223031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109694.

The product of its (nonzero) digits is 648, while the sum is 22.

Adding to 213131223031 its reverse (130322131312), we get a palindrome (343453354343).

The spelling of 213131223031 in words is "two hundred thirteen billion, one hundred thirty-one million, two hundred twenty-three thousand, thirty-one".