211131431012 has 6 divisors (see below), whose sum is σ = 369480004278. Its totient is φ = 105565715504.

The previous prime is 211131431011. The next prime is 211131431081. The reversal of 211131431012 is 210134131112.

It can be written as a sum of positive squares in only one way, i.e., 131757384256 + 79374046756 = 362984^2 + 281734^2 .

It is a super-2 number, since 2×211131431012² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (211131431011) 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 as a sum of consecutive naturals, namely, 26391428873 + ... + 26391428880.

It is an arithmetic number, because the mean of its divisors is an integer number (61580000713).

Almost surely, 2^211131431012 is an apocalyptic number.

It is an amenable number.

211131431012 is a deficient number, since it is larger than the sum of its proper divisors (158348573266).

211131431012 is a wasteful number, since it uses less digits than its factorization.

211131431012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52782857757 (or 52782857755 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 20.

Adding to 211131431012 its reverse (210134131112), we get a palindrome (421265562124).

The spelling of 211131431012 in words is "two hundred eleven billion, one hundred thirty-one million, four hundred thirty-one thousand, twelve".