21221200010120 has 64 divisors (see below), whose sum is σ = 52114303938240. Its totient is φ = 7712962387200.

The previous prime is 21221200010111. The next prime is 21221200010159. The reversal of 21221200010120 is 2101000212212.

It is a junction number, because it is equal to n+sod(n) for n = 21221200010095 and 21221200010104.

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, 11106707 + ... + 12876386.

It is an arithmetic number, because the mean of its divisors is an integer number (814285999035).

Almost surely, 2^{21221200010120} is an apocalyptic number.

21221200010120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21221200010120 is an abundant number, since it is smaller than the sum of its proper divisors (30893103928120).

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

21221200010120 is a wasteful number, since it uses less digits than its factorization.

21221200010120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23985126 (or 23985122 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21221200010120 its reverse (2101000212212), we get a palindrome (23322200222332).

The spelling of 21221200010120 in words is "twenty-one trillion, two hundred twenty-one billion, two hundred million, ten thousand, one hundred twenty".