21342000000 has 224 divisors, whose sum is σ = 70881123960. Its totient is φ = 5689600000.

The previous prime is 21341999981. The next prime is 21342000077. The reversal of 21342000000 is 24312.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a self number, because there is not a number n which added to its sum of digits gives 21342000000.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 5998222 + ... + 6001778.

Almost surely, 2^21342000000 is an apocalyptic number.

21342000000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21342000000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35440561980).

21342000000 is an abundant number, since it is smaller than the sum of its proper divisors (49539123960).

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

21342000000 is an frugal number, since it uses more digits than its factorization.

21342000000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3604 (or 3567 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 12.

Adding to 21342000000 its reverse (24312), we get a palindrome (21342024312).

The spelling of 21342000000 in words is "twenty-one billion, three hundred forty-two million", and thus it is an aban number.