21340330242 has 64 divisors (see below), whose sum is σ = 53295750144. Its totient is φ = 5534245440.

The previous prime is 21340330241. The next prime is 21340330247. The reversal of 21340330242 is 24203304312.

It is not an unprimeable number, because it can be changed into a prime (21340330241) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 261148 + ... + 332984.

It is an arithmetic number, because the mean of its divisors is an integer number (832746096).

Almost surely, 2^21340330242 is an apocalyptic number.

21340330242 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 21340330242, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26647875072).

21340330242 is an abundant number, since it is smaller than the sum of its proper divisors (31955419902).

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

21340330242 is a wasteful number, since it uses less digits than its factorization.

21340330242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72503.

The product of its (nonzero) digits is 3456, while the sum is 24.

Adding to 21340330242 its reverse (24203304312), we get a palindrome (45543634554).

The spelling of 21340330242 in words is "twenty-one billion, three hundred forty million, three hundred thirty thousand, two hundred forty-two".