21231330120 has 1024 divisors, whose sum is σ = 97542144000. Its totient is φ = 3964723200.

The previous prime is 21231330091. The next prime is 21231330179. The reversal of 21231330120 is 2103313212.

21231330120 is a `hidden beast` number, since 212 + 3 + 1 + 330 + 120 = 666.

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

It is a junction number, because it is equal to n+sod(n) for n = 21231330093 and 21231330102.

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 255 ways as a sum of consecutive naturals, for example, 44324041 + ... + 44324519.

It is an arithmetic number, because the mean of its divisors is an integer number (95256000).

Almost surely, 2^21231330120 is an apocalyptic number.

21231330120 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 21231330120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (48771072000).

21231330120 is an abundant number, since it is smaller than the sum of its proper divisors (76310813880).

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

21231330120 is a wasteful number, since it uses less digits than its factorization.

21231330120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 571 (or 561 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 21231330120 its reverse (2103313212), we get a palindrome (23334643332).

The spelling of 21231330120 in words is "twenty-one billion, two hundred thirty-one million, three hundred thirty thousand, one hundred twenty".