211111223131 has 8 divisors (see below), whose sum is σ = 223564425840. Its totient is φ = 198661897728.

The previous prime is 211111223129. The next prime is 211111223149. The reversal of 211111223131 is 131322111112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 211111223131 - 2¹ = 211111223129 is a prime.

It is a super-2 number, since 2×211111223131² (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 = 211111223099 and 211111223108.

It is not an unprimeable number, because it can be changed into a prime (211111223111) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 856846 + ... + 1075363.

It is an arithmetic number, because the mean of its divisors is an integer number (27945553230).

Almost surely, 2^211111223131 is an apocalyptic number.

211111223131 is a deficient number, since it is larger than the sum of its proper divisors (12453202709).

211111223131 is a wasteful number, since it uses less digits than its factorization.

211111223131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1938653.

The product of its digits is 72, while the sum is 19.

Adding to 211111223131 its reverse (131322111112), we get a palindrome (342433334243).

The spelling of 211111223131 in words is "two hundred eleven billion, one hundred eleven million, two hundred twenty-three thousand, one hundred thirty-one".