21342341020 has 144 divisors (see below), whose sum is σ = 61251428448. Its totient is φ = 6140413440.

The previous prime is 21342340993. The next prime is 21342341051. The reversal of 21342341020 is 2014324312.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a junction number, because it is equal to n+sod(n) for n = 21342340982 and 21342341000.

It is a congruent number.

It is an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 63994 + ... + 216286.

It is an arithmetic number, because the mean of its divisors is an integer number (425357142).

Almost surely, 2^21342341020 is an apocalyptic number.

21342341020 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 21342341020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30625714224).

21342341020 is an abundant number, since it is smaller than the sum of its proper divisors (39909087428).

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

21342341020 is a wasteful number, since it uses less digits than its factorization.

21342341020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152340 (or 152331 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 22.

Adding to 21342341020 its reverse (2014324312), we get a palindrome (23356665332).

The spelling of 21342341020 in words is "twenty-one billion, three hundred forty-two million, three hundred forty-one thousand, twenty".