21323103544120 has 192 divisors, whose sum is σ = 57962500344000. Its totient is φ = 6914342037504.

The previous prime is 21323103544103. The next prime is 21323103544123. The reversal of 21323103544120 is 2144530132312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21323103544123) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 12373926 + ... + 13991434.

It is an arithmetic number, because the mean of its divisors is an integer number (301888022625).

Almost surely, 2^{21323103544120} is an apocalyptic number.

21323103544120 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 21323103544120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28981250172000).

21323103544120 is an abundant number, since it is smaller than the sum of its proper divisors (36639396799880).

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

21323103544120 is a wasteful number, since it uses less digits than its factorization.

21323103544120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1617662 (or 1617635 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 31.

Adding to 21323103544120 its reverse (2144530132312), we get a palindrome (23467633676432).

The spelling of 21323103544120 in words is "twenty-one trillion, three hundred twenty-three billion, one hundred three million, five hundred forty-four thousand, one hundred twenty".