21323412000 has 960 divisors, whose sum is σ = 88589749248. Its totient is φ = 4976640000.

The previous prime is 21323411971. The next prime is 21323412067. The reversal of 21323412000 is 21432312.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 110483904 + ... + 110484096.

Almost surely, 2^21323412000 is an apocalyptic number.

21323412000 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 21323412000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44294874624).

21323412000 is an abundant number, since it is smaller than the sum of its proper divisors (67266337248).

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

21323412000 is a wasteful number, since it uses less digits than its factorization.

21323412000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 272 (or 245 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

Adding to 21323412000 its reverse (21432312), we get a palindrome (21344844312).

The spelling of 21323412000 in words is "twenty-one billion, three hundred twenty-three million, four hundred twelve thousand".