21233323544400 has 720 divisors, whose sum is σ = 80842454858880. Its totient is φ = 5118217113600.

The previous prime is 21233323544369. The next prime is 21233323544453. The reversal of 21233323544400 is 444532333212.

21233323544400 is a `hidden beast` number, since 2 + 1 + 23 + 33 + 23 + 544 + 40 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (720).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 5510852874 + ... + 5510856726.

It is an arithmetic number, because the mean of its divisors is an integer number (112281187304).

Almost surely, 2^{21233323544400} is an apocalyptic number.

21233323544400 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 21233323544400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40421227429440).

21233323544400 is an abundant number, since it is smaller than the sum of its proper divisors (59609131314480).

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

21233323544400 is a wasteful number, since it uses less digits than its factorization.

21233323544400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4644 (or 4630 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 36.

Adding to 21233323544400 its reverse (444532333212), we get a palindrome (21677855877612).

The spelling of 21233323544400 in words is "twenty-one trillion, two hundred thirty-three billion, three hundred twenty-three million, five hundred forty-four thousand, four hundred".