213111030031 has 4 divisors (see below), whose sum is σ = 225646972992. Its totient is φ = 200575087072.

The previous prime is 213111030017. The next prime is 213111030049. The reversal of 213111030031 is 130030111312.

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 213111030031 - 2¹⁹ = 213110505743 is a prime.

It is a super-3 number, since 3×213111030031³ (a number of 35 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 213111029987 and 213111030014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213111030071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6267971455 + ... + 6267971488.

It is an arithmetic number, because the mean of its divisors is an integer number (56411743248).

Almost surely, 2^213111030031 is an apocalyptic number.

213111030031 is a deficient number, since it is larger than the sum of its proper divisors (12535942961).

213111030031 is a wasteful number, since it uses less digits than its factorization.

213111030031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12535942960.

The product of its (nonzero) digits is 54, while the sum is 16.

Adding to 213111030031 its reverse (130030111312), we get a palindrome (343141141343).

The spelling of 213111030031 in words is "two hundred thirteen billion, one hundred eleven million, thirty thousand, thirty-one".