21033021120 has 112 divisors (see below), whose sum is σ = 67530451680. Its totient is φ = 5545762816.

The previous prime is 21033021091. The next prime is 21033021127. The reversal of 21033021120 is 2112033012.

It is a super-3 number, since 3×21033021120³ (a number of 32 digits) contains 333 as substring.

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

It is a self number, because there is not a number n which added to its sum of digits gives 21033021120.

It is not an unprimeable number, because it can be changed into a prime (21033021127) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 37647 + ... + 208526.

Almost surely, 2^21033021120 is an apocalyptic number.

21033021120 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 21033021120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33765225840).

21033021120 is an abundant number, since it is smaller than the sum of its proper divisors (46497430560).

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

21033021120 is a wasteful number, since it uses less digits than its factorization.

21033021120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 246282 (or 246272 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 21033021120 its reverse (2112033012), we get a palindrome (23145054132).

The spelling of 21033021120 in words is "twenty-one billion, thirty-three million, twenty-one thousand, one hundred twenty".