21330243055220 has 96 divisors (see below), whose sum is σ = 50662233216000. Its totient is φ = 7473464985600.

The previous prime is 21330243055211. The next prime is 21330243055237. The reversal of 21330243055220 is 2255034203312.

It is a super-2 number, since 2×21330243055220² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5267045 + ... + 8390604.

It is an arithmetic number, because the mean of its divisors is an integer number (527731596000).

Almost surely, 2^{21330243055220} is an apocalyptic number.

21330243055220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21330243055220 is an abundant number, since it is smaller than the sum of its proper divisors (29331990160780).

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

21330243055220 is a wasteful number, since it uses less digits than its factorization.

21330243055220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13657929 (or 13657927 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 32.

Adding to 21330243055220 its reverse (2255034203312), we get a palindrome (23585277258532).

The spelling of 21330243055220 in words is "twenty-one trillion, three hundred thirty billion, two hundred forty-three million, fifty-five thousand, two hundred twenty".