21323122000 has 80 divisors (see below), whose sum is σ = 52091322192. Its totient is φ = 8441241600.

The previous prime is 21323121979. The next prime is 21323122013. The reversal of 21323122000 is 22132312.

It can be written as a sum of positive squares in 8 ways, for example, as 9518734096 + 11804387904 = 97564^2 + 108648^2 .

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 139044 + ... + 248956.

Almost surely, 2^21323122000 is an apocalyptic number.

21323122000 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 21323122000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26045661096).

21323122000 is an abundant number, since it is smaller than the sum of its proper divisors (30768200192).

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

21323122000 is a wasteful number, since it uses less digits than its factorization.

21323122000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110033 (or 110017 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

Adding to 21323122000 its reverse (22132312), we get a palindrome (21345254312).

It can be divided in two parts, 2132312 and 2000, that added together give a palindrome (2134312).

The spelling of 21323122000 in words is "twenty-one billion, three hundred twenty-three million, one hundred twenty-two thousand".