21040234324320 has 48 divisors (see below), whose sum is σ = 66276738123120. Its totient is φ = 5610729153024.

The previous prime is 21040234324303. The next prime is 21040234324327. The reversal of 21040234324320 is 2342343204012.

It is a tau number, because it is divible by the number of its divisors (48).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21040234324327) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21916910275 + ... + 21916911234.

It is an arithmetic number, because the mean of its divisors is an integer number (1380765377565).

Almost surely, 2^{21040234324320} is an apocalyptic number.

21040234324320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21040234324320 is an abundant number, since it is smaller than the sum of its proper divisors (45236503798800).

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

21040234324320 is a wasteful number, since it uses less digits than its factorization.

21040234324320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43833821527 (or 43833821519 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 30.

Adding to 21040234324320 its reverse (2342343204012), we get a palindrome (23382577528332).

The spelling of 21040234324320 in words is "twenty-one trillion, forty billion, two hundred thirty-four million, three hundred twenty-four thousand, three hundred twenty".