21040033320 has 96 divisors (see below), whose sum is σ = 69085172520. Its totient is φ = 5552824320.

The previous prime is 21040033309. The next prime is 21040033369. The reversal of 21040033320 is 2333004012.

21040033320 is a `hidden beast` number, since 210 + 400 + 3 + 33 + 20 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 12163001796 + 8877031524 = 110286^2 + 94218^2 .

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 = 21040033293 and 21040033302.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 266341 + ... + 336180.

Almost surely, 2^21040033320 is an apocalyptic number.

21040033320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21040033320 is an abundant number, since it is smaller than the sum of its proper divisors (48045139200).

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

21040033320 is a wasteful number, since it uses less digits than its factorization.

21040033320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 602635 (or 602628 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 18.

Adding to 21040033320 its reverse (2333004012), we get a palindrome (23373037332).

The spelling of 21040033320 in words is "twenty-one billion, forty million, thirty-three thousand, three hundred twenty".