21323322400 has 72 divisors (see below), whose sum is σ = 52302683664. Its totient is φ = 8488838400.

The previous prime is 21323322359. The next prime is 21323322403. The reversal of 21323322400 is 422332312.

It is not an unprimeable number, because it can be changed into a prime (21323322403) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 105639 + ... + 231961.

It is an arithmetic number, because the mean of its divisors is an integer number (726426162).

Almost surely, 2^21323322400 is an apocalyptic number.

21323322400 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 21323322400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26151341832).

21323322400 is an abundant number, since it is smaller than the sum of its proper divisors (30979361264).

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

21323322400 is a wasteful number, since it uses less digits than its factorization.

21323322400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126554 (or 126541 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 22.

Adding to 21323322400 its reverse (422332312), we get a palindrome (21745654712).

The spelling of 21323322400 in words is "twenty-one billion, three hundred twenty-three million, three hundred twenty-two thousand, four hundred".