21000221222120 has 64 divisors (see below), whose sum is σ = 54043804800000. Its totient is φ = 7194311055360.

The previous prime is 21000221222111. The next prime is 21000221222131. The reversal of 21000221222120 is 2122212200012.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29674616 + ... + 30374055.

It is an arithmetic number, because the mean of its divisors is an integer number (844434450000).

Almost surely, 2^{21000221222120} is an apocalyptic number.

21000221222120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21000221222120 is an abundant number, since it is smaller than the sum of its proper divisors (33043583577880).

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

21000221222120 is a wasteful number, since it uses less digits than its factorization.

21000221222120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60049938 (or 60049934 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 21000221222120 its reverse (2122212200012), we get a palindrome (23122433422132).

The spelling of 21000221222120 in words is "twenty-one trillion, two hundred twenty-one million, two hundred twenty-two thousand, one hundred twenty".