21113235342 has 144 divisors (see below), whose sum is σ = 49887059040. Its totient is φ = 6444966528.

The previous prime is 21113235293. The next prime is 21113235349. The reversal of 21113235342 is 24353231112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21113235349) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 43353423 + ... + 43353909.

It is an arithmetic number, because the mean of its divisors is an integer number (346437910).

Almost surely, 2^21113235342 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21113235342, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24943529520).

21113235342 is an abundant number, since it is smaller than the sum of its proper divisors (28773823698).

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

21113235342 is a wasteful number, since it uses less digits than its factorization.

21113235342 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 727 (or 701 counting only the distinct ones).

The product of its digits is 4320, while the sum is 27.

Adding to 21113235342 its reverse (24353231112), we get a palindrome (45466466454).

The spelling of 21113235342 in words is "twenty-one billion, one hundred thirteen million, two hundred thirty-five thousand, three hundred forty-two".