212134431211 has 4 divisors (see below), whose sum is σ = 212264816632. Its totient is φ = 212004045792.

The previous prime is 212134431143. The next prime is 212134431217. The reversal of 212134431211 is 112134431212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 212134431211 - 2¹⁷ = 212134300139 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212134431217) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 65190270 + ... + 65193523.

It is an arithmetic number, because the mean of its divisors is an integer number (53066204158).

Almost surely, 2^212134431211 is an apocalyptic number.

212134431211 is a deficient number, since it is larger than the sum of its proper divisors (130385421).

212134431211 is a wasteful number, since it uses less digits than its factorization.

212134431211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130385420.

The product of its digits is 1152, while the sum is 25.

Adding to 212134431211 its reverse (112134431212), we get a palindrome (324268862423).

Subtracting from 212134431211 its reverse (112134431212), we obtain a palindrome (99999999999).

The spelling of 212134431211 in words is "two hundred twelve billion, one hundred thirty-four million, four hundred thirty-one thousand, two hundred eleven".