21002023123000 has 128 divisors (see below), whose sum is σ = 49638814243200. Its totient is φ = 8316376320000.

The previous prime is 21002023122959. The next prime is 21002023123009. The reversal of 21002023123000 is 32132020012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21002023123009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 957368032 + ... + 957389968.

It is an arithmetic number, because the mean of its divisors is an integer number (387803236275).

Almost surely, 2^{21002023123000} is an apocalyptic number.

21002023123000 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 21002023123000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24819407121600).

21002023123000 is an abundant number, since it is smaller than the sum of its proper divisors (28636791120200).

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

21002023123000 is a wasteful number, since it uses less digits than its factorization.

21002023123000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31538 (or 31524 counting only the distinct ones).

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

Adding to 21002023123000 its reverse (32132020012), we get a palindrome (21034155143012).

The spelling of 21002023123000 in words is "twenty-one trillion, two billion, twenty-three million, one hundred twenty-three thousand".