21031332120 has 384 divisors, whose sum is σ = 71999928000. Its totient is φ = 5319475200.

The previous prime is 21031332103. The next prime is 21031332131. The reversal of 21031332120 is 2123313012.

21031332120 is a `hidden beast` number, since 2 + 10 + 313 + 321 + 20 = 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 = 21031332093 and 21031332102.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 141149806 + ... + 141149954.

Almost surely, 2^21031332120 is an apocalyptic number.

21031332120 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 21031332120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35999964000).

21031332120 is an abundant number, since it is smaller than the sum of its proper divisors (50968595880).

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

21031332120 is a wasteful number, since it uses less digits than its factorization.

21031332120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 411 (or 404 counting only the distinct ones).

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

Adding to 21031332120 its reverse (2123313012), we get a palindrome (23154645132).

The spelling of 21031332120 in words is "twenty-one billion, thirty-one million, three hundred thirty-two thousand, one hundred twenty".