21333210210320 has 80 divisors (see below), whose sum is σ = 50210685060480. Its totient is φ = 8428225569792.

The previous prime is 21333210210287. The next prime is 21333210210337. The reversal of 21333210210320 is 2301201233312.

It is a tau number, because it is divible by the number of its divisors (80).

It is an unprimeable number.

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, 24586436 + ... + 25439324.

It is an arithmetic number, because the mean of its divisors is an integer number (627633563256).

Almost surely, 2^{21333210210320} is an apocalyptic number.

21333210210320 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 21333210210320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25105342530240).

21333210210320 is an abundant number, since it is smaller than the sum of its proper divisors (28877474850160).

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

21333210210320 is a wasteful number, since it uses less digits than its factorization.

21333210210320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 856752 (or 856746 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 23.

Adding to 21333210210320 its reverse (2301201233312), we get a palindrome (23634411443632).

The spelling of 21333210210320 in words is "twenty-one trillion, three hundred thirty-three billion, two hundred ten million, two hundred ten thousand, three hundred twenty".