21133333420 has 96 divisors (see below), whose sum is σ = 47990408256. Its totient is φ = 7787520000.

The previous prime is 21133333399. The next prime is 21133333421. The reversal of 21133333420 is 2433333112.

It is not an unprimeable number, because it can be changed into a prime (21133333421) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9387295 + ... + 9389545.

It is an arithmetic number, because the mean of its divisors is an integer number (499900086).

Almost surely, 2^21133333420 is an apocalyptic number.

21133333420 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 21133333420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23995204128).

21133333420 is an abundant number, since it is smaller than the sum of its proper divisors (26857074836).

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

21133333420 is a wasteful number, since it uses less digits than its factorization.

21133333420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2851 (or 2849 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 25.

Adding to 21133333420 its reverse (2433333112), we get a palindrome (23566666532).

The spelling of 21133333420 in words is "twenty-one billion, one hundred thirty-three million, three hundred thirty-three thousand, four hundred twenty".