211231023133 has 4 divisors (see below), whose sum is σ = 227479563388. Its totient is φ = 194982482880.

The previous prime is 211231023119. The next prime is 211231023173. The reversal of 211231023133 is 331320132112.

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

It can be written as a sum of positive squares in 2 ways, for example, as 21328557849 + 189902465284 = 146043^2 + 435778^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211231023133 is a prime.

It is a super-2 number, since 2×211231023133² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211231023173) 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, 8124270108 + ... + 8124270133.

It is an arithmetic number, because the mean of its divisors is an integer number (56869890847).

Almost surely, 2^211231023133 is an apocalyptic number.

It is an amenable number.

211231023133 is a deficient number, since it is larger than the sum of its proper divisors (16248540255).

211231023133 is a wasteful number, since it uses less digits than its factorization.

211231023133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16248540254.

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

Adding to 211231023133 its reverse (331320132112), we get a palindrome (542551155245).

The spelling of 211231023133 in words is "two hundred eleven billion, two hundred thirty-one million, twenty-three thousand, one hundred thirty-three".