211404342340 has 12 divisors (see below), whose sum is σ = 443949118956. Its totient is φ = 84561736928.

The previous prime is 211404342269. The next prime is 211404342349. The reversal of 211404342340 is 43243404112.

It can be written as a sum of positive squares in 2 ways, for example, as 59290302016 + 152114040324 = 243496^2 + 390018^2 .

It is a junction number, because it is equal to n+sod(n) for n = 211404342299 and 211404342308.

It is not an unprimeable number, because it can be changed into a prime (211404342349) 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, 5285108539 + ... + 5285108578.

It is an arithmetic number, because the mean of its divisors is an integer number (36995759913).

Almost surely, 2^211404342340 is an apocalyptic number.

211404342340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

211404342340 is an abundant number, since it is smaller than the sum of its proper divisors (232544776616).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

211404342340 is a wasteful number, since it uses less digits than its factorization.

211404342340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10570217126 (or 10570217124 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 28.

Adding to 211404342340 its reverse (43243404112), we get a palindrome (254647746452).

The spelling of 211404342340 in words is "two hundred eleven billion, four hundred four million, three hundred forty-two thousand, three hundred forty".