211231231331 has 16 divisors (see below), whose sum is σ = 219746554368. Its totient is φ = 202881520800.

The previous prime is 211231231279. The next prime is 211231231369. The reversal of 211231231331 is 133132132112.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211231231331 is a prime.

It is a super-2 number, since 2×211231231331² (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 = 211231231297 and 211231231306.

It is not an unprimeable number, because it can be changed into a prime (211231231381) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12295910 + ... + 12313076.

It is an arithmetic number, because the mean of its divisors is an integer number (13734159648).

Almost surely, 2^211231231331 is an apocalyptic number.

211231231331 is a deficient number, since it is larger than the sum of its proper divisors (8515323037).

211231231331 is a wasteful number, since it uses less digits than its factorization.

211231231331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21962.

The product of its digits is 648, while the sum is 23.

Adding to 211231231331 its reverse (133132132112), we get a palindrome (344363363443).

The spelling of 211231231331 in words is "two hundred eleven billion, two hundred thirty-one million, two hundred thirty-one thousand, three hundred thirty-one".