21344204020 has 24 divisors (see below), whose sum is σ = 44830443168. Its totient is φ = 8536231200.

The previous prime is 21344204017. The next prime is 21344204039. The reversal of 21344204020 is 2040244312.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21344203982 and 21344204000.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 34215 + ... + 209425.

It is an arithmetic number, because the mean of its divisors is an integer number (1867935132).

Almost surely, 2^21344204020 is an apocalyptic number.

21344204020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21344204020 is an abundant number, since it is smaller than the sum of its proper divisors (23486239148).

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

21344204020 is a wasteful number, since it uses less digits than its factorization.

21344204020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 181311 (or 181309 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 22.

Adding to 21344204020 its reverse (2040244312), we get a palindrome (23384448332).

The spelling of 21344204020 in words is "twenty-one billion, three hundred forty-four million, two hundred four thousand, twenty".