21330012221220 has 48 divisors (see below), whose sum is σ = 60994758359808. Its totient is φ = 5566981912320.

The previous prime is 21330012221213. The next prime is 21330012221303. The reversal of 21330012221220 is 2212221003312.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3781914241 + ... + 3781919880.

It is an arithmetic number, because the mean of its divisors is an integer number (1270724132496).

Almost surely, 2^{21330012221220} is an apocalyptic number.

21330012221220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21330012221220 is an abundant number, since it is smaller than the sum of its proper divisors (39664746138588).

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

21330012221220 is a wasteful number, since it uses less digits than its factorization.

21330012221220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7563834180 (or 7563834178 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 21330012221220 its reverse (2212221003312), we get a palindrome (23542233224532).

The spelling of 21330012221220 in words is "twenty-one trillion, three hundred thirty billion, twelve million, two hundred twenty-one thousand, two hundred twenty".