211131430021 has 4 divisors (see below), whose sum is σ = 217942121344. Its totient is φ = 204320738700.

The previous prime is 211131430007. The next prime is 211131430033. The reversal of 211131430021 is 120034131112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 211131430021 - 2⁷ = 211131429893 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 (211131430721) 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 in 3 ways as a sum of consecutive naturals, for example, 3405345615 + ... + 3405345676.

It is an arithmetic number, because the mean of its divisors is an integer number (54485530336).

Almost surely, 2^211131430021 is an apocalyptic number.

It is an amenable number.

211131430021 is a deficient number, since it is larger than the sum of its proper divisors (6810691323).

211131430021 is an equidigital number, since it uses as much as digits as its factorization.

211131430021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6810691322.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 211131430021 its reverse (120034131112), we get a palindrome (331165561133).

The spelling of 211131430021 in words is "two hundred eleven billion, one hundred thirty-one million, four hundred thirty thousand, twenty-one".