21133443320 has 64 divisors (see below), whose sum is σ = 51902661600. Its totient is φ = 7680494080.

The previous prime is 21133443307. The next prime is 21133443323. The reversal of 21133443320 is 2334433112.

It is a self number, because there is not a number n which added to its sum of digits gives 21133443320.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21133443323) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 813086 + ... + 838674.

Almost surely, 2^21133443320 is an apocalyptic number.

21133443320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21133443320 is an abundant number, since it is smaller than the sum of its proper divisors (30769218280).

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

21133443320 is a wasteful number, since it uses less digits than its factorization.

21133443320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27488 (or 27484 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 26.

Adding to 21133443320 its reverse (2334433112), we get a palindrome (23467876432).

The spelling of 21133443320 in words is "twenty-one billion, one hundred thirty-three million, four hundred forty-three thousand, three hundred twenty".