211238134842 has 64 divisors (see below), whose sum is σ = 499818184704. Its totient is φ = 58241272320.

The previous prime is 211238134841. The next prime is 211238134853. The reversal of 211238134842 is 248431832112.

It is a happy number.

It is a super-2 number, since 2×211238134842² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 211238134842.

It is not an unprimeable number, because it can be changed into a prime (211238134841) 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 31 ways as a sum of consecutive naturals, for example, 229803 + ... + 689409.

It is an arithmetic number, because the mean of its divisors is an integer number (7809659136).

Almost surely, 2^211238134842 is an apocalyptic number.

It is a pronic number, being equal to 459606×459607.

It is a practical number, because each smaller number is the sum of distinct divisors of 211238134842, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (249909092352).

211238134842 is an abundant number, since it is smaller than the sum of its proper divisors (288580049862).

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

211238134842 is a wasteful number, since it uses less digits than its factorization.

211238134842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 460003.

The product of its digits is 73728, while the sum is 39.

Adding to 211238134842 its reverse (248431832112), we get a palindrome (459669966954).

The spelling of 211238134842 in words is "two hundred eleven billion, two hundred thirty-eight million, one hundred thirty-four thousand, eight hundred forty-two".