21032123120 has 80 divisors (see below), whose sum is σ = 50289102720. Its totient is φ = 8174426112.

The previous prime is 21032123029. The next prime is 21032123171. The reversal of 21032123120 is 2132123012.

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

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 2390249 + ... + 2399031.

It is an arithmetic number, because the mean of its divisors is an integer number (628613784).

Almost surely, 2^21032123120 is an apocalyptic number.

21032123120 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 21032123120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25144551360).

21032123120 is an abundant number, since it is smaller than the sum of its proper divisors (29256979600).

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

21032123120 is a wasteful number, since it uses less digits than its factorization.

21032123120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9642 (or 9636 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 21032123120 its reverse (2132123012), we get a palindrome (23164246132).

The spelling of 21032123120 in words is "twenty-one billion, thirty-two million, one hundred twenty-three thousand, one hundred twenty".