213110031 has 4 divisors (see below), whose sum is σ = 284146712. Its totient is φ = 142073352.

The previous prime is 213109993. The next prime is 213110033. The reversal of 213110031 is 130011312.

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

It is not a de Polignac number, because 213110031 - 2¹³ = 213101839 is a prime.

It is a super-2 number, since 2×213110031² = 90831770625641922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 213109989 and 213110016.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213110033) 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, 35518336 + ... + 35518341.

It is an arithmetic number, because the mean of its divisors is an integer number (71036678).

Almost surely, 2^213110031 is an apocalyptic number.

213110031 is a deficient number, since it is larger than the sum of its proper divisors (71036681).

213110031 is an equidigital number, since it uses as much as digits as its factorization.

213110031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71036680.

The product of its (nonzero) digits is 18, while the sum is 12.

The square root of 213110031 is about 14598.2886325761. The cubic root of 213110031 is about 597.3120792291.

Adding to 213110031 its reverse (130011312), we get a palindrome (343121343).

The spelling of 213110031 in words is "two hundred thirteen million, one hundred ten thousand, thirty-one".