21330123000 has 128 divisors (see below), whose sum is σ = 66606546240. Its totient is φ = 5683200000.

The previous prime is 21330122993. The next prime is 21330123029. The reversal of 21330123000 is 32103312.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4800780 + ... + 4805220.

Almost surely, 2^21330123000 is an apocalyptic number.

21330123000 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 21330123000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33303273120).

21330123000 is an abundant number, since it is smaller than the sum of its proper divisors (45276423240).

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

21330123000 is a wasteful number, since it uses less digits than its factorization.

21330123000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6066 (or 6052 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 15.

Adding to 21330123000 its reverse (32103312), we get a palindrome (21362226312).

The spelling of 21330123000 in words is "twenty-one billion, three hundred thirty million, one hundred twenty-three thousand".