21022100101220 has 12 divisors (see below), whose sum is σ = 44146410212604. Its totient is φ = 8408840040480.

The previous prime is 21022100101141. The next prime is 21022100101351. The reversal of 21022100101220 is 2210100122012.

It can be written as a sum of positive squares in 2 ways, for example, as 5040590755876 + 15981509345344 = 2245126^2 + 3997688^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21022100101195 and 21022100101204.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 525552502511 + ... + 525552502550.

It is an arithmetic number, because the mean of its divisors is an integer number (3678867517717).

Almost surely, 2^{21022100101220} is an apocalyptic number.

21022100101220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21022100101220 is an abundant number, since it is smaller than the sum of its proper divisors (23124310111384).

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

21022100101220 is a wasteful number, since it uses less digits than its factorization.

21022100101220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1051105005070 (or 1051105005068 counting only the distinct ones).

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

Adding to 21022100101220 its reverse (2210100122012), we get a palindrome (23232200223232).

The spelling of 21022100101220 in words is "twenty-one trillion, twenty-two billion, one hundred million, one hundred one thousand, two hundred twenty".