21200122101220 has 48 divisors (see below), whose sum is σ = 44663709167280. Its totient is φ = 8452766334464.

The previous prime is 21200122101217. The next prime is 21200122101247. The reversal of 21200122101220 is 2210122100212.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 1483485024256 + 19716637076964 = 1217984^2 + 4440342^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21200122101194 and 21200122101203.

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, 6806982 + ... + 9419938.

It is an arithmetic number, because the mean of its divisors is an integer number (930493940985).

Almost surely, 2^{21200122101220} is an apocalyptic number.

21200122101220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21200122101220 is an abundant number, since it is smaller than the sum of its proper divisors (23463587066060).

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

21200122101220 is a wasteful number, since it uses less digits than its factorization.

21200122101220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2614272 (or 2614270 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21200122101220 its reverse (2210122100212), we get a palindrome (23410244201432).

The spelling of 21200122101220 in words is "twenty-one trillion, two hundred billion, one hundred twenty-two million, one hundred one thousand, two hundred twenty".