211031223013 has 4 divisors (see below), whose sum is σ = 227264394028. Its totient is φ = 194798052000.

The previous prime is 211031222989. The next prime is 211031223019. The reversal of 211031223013 is 310322130112.

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 49453753924 + 161577469089 = 222382^2 + 401967^2 .

It is a cyclic number.

It is not a de Polignac number, because 211031223013 - 2³³ = 202441288421 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211031223019) 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, 8116585488 + ... + 8116585513.

It is an arithmetic number, because the mean of its divisors is an integer number (56816098507).

Almost surely, 2^211031223013 is an apocalyptic number.

It is an amenable number.

211031223013 is a deficient number, since it is larger than the sum of its proper divisors (16233171015).

211031223013 is a wasteful number, since it uses less digits than its factorization.

211031223013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16233171014.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 211031223013 its reverse (310322130112), we get a palindrome (521353353125).

The spelling of 211031223013 in words is "two hundred eleven billion, thirty-one million, two hundred twenty-three thousand, thirteen".