21202100002220 has 48 divisors (see below), whose sum is σ = 44865289421568. Its totient is φ = 8415913471680.

The previous prime is 21202100002159. The next prime is 21202100002231. The reversal of 21202100002220 is 2220000120212.

It is a junction number, because it is equal to n+sod(n) for n = 21202100002195 and 21202100002204.

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, 225490457 + ... + 225584463.

It is an arithmetic number, because the mean of its divisors is an integer number (934693529616).

Almost surely, 2^{21202100002220} is an apocalyptic number.

21202100002220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21202100002220 is an abundant number, since it is smaller than the sum of its proper divisors (23663189419348).

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

21202100002220 is a wasteful number, since it uses less digits than its factorization.

21202100002220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180230 (or 180228 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 14.

Adding to 21202100002220 its reverse (2220000120212), we get a palindrome (23422100122432).

The spelling of 21202100002220 in words is "twenty-one trillion, two hundred two billion, one hundred million, two thousand, two hundred twenty".