21333132331420 has 288 divisors, whose sum is σ = 57320122305600. Its totient is φ = 6609009770496.

The previous prime is 21333132331409. The next prime is 21333132331451. The reversal of 21333132331420 is 2413323133312.

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, 115166236 + ... + 115351324.

It is an arithmetic number, because the mean of its divisors is an integer number (199028202450).

Almost surely, 2^{21333132331420} is an apocalyptic number.

21333132331420 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 21333132331420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28660061152800).

21333132331420 is an abundant number, since it is smaller than the sum of its proper divisors (35986989974180).

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

21333132331420 is a wasteful number, since it uses less digits than its factorization.

21333132331420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 185317 (or 185308 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 31.

Adding to 21333132331420 its reverse (2413323133312), we get a palindrome (23746455464732).

The spelling of 21333132331420 in words is "twenty-one trillion, three hundred thirty-three billion, one hundred thirty-two million, three hundred thirty-one thousand, four hundred twenty".