211431211021213 has 4 divisors (see below), whose sum is σ = 212098186450620. Its totient is φ = 210764235591808.

The previous prime is 211431211021183. The next prime is 211431211021237. The reversal of 211431211021213 is 312120112134112.

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 45977580578329 + 165453630442884 = 6780677^2 + 12862878^2 .

It is a cyclic number.

It is not a de Polignac number, because 211431211021213 - 2²⁵ = 211431177466781 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 (211431251021213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 333487714228 + ... + 333487714861.

It is an arithmetic number, because the mean of its divisors is an integer number (53024546612655).

Almost surely, 2^{211431211021213} is an apocalyptic number.

It is an amenable number.

211431211021213 is a deficient number, since it is larger than the sum of its proper divisors (666975429407).

211431211021213 is an equidigital number, since it uses as much as digits as its factorization.

211431211021213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 666975429406.

The product of its (nonzero) digits is 576, while the sum is 25.

Adding to 211431211021213 its reverse (312120112134112), we get a palindrome (523551323155325).

The spelling of 211431211021213 in words is "two hundred eleven trillion, four hundred thirty-one billion, two hundred eleven million, twenty-one thousand, two hundred thirteen".