21222022100220 has 36 divisors (see below), whose sum is σ = 64373467037880. Its totient is φ = 5659205893344.

The previous prime is 21222022100189. The next prime is 21222022100221. The reversal of 21222022100220 is 2200122022212.

21222022100220 is a `hidden beast` number, since 2 + 1 + 2 + 220 + 221 + 0 + 0 + 220 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 21222022100193 and 21222022100202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21222022100221) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 58950061210 + ... + 58950061569.

Almost surely, 2^{21222022100220} is an apocalyptic number.

21222022100220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21222022100220 is an abundant number, since it is smaller than the sum of its proper divisors (43151444937660).

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

21222022100220 is a wasteful number, since it uses less digits than its factorization.

21222022100220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117900122794 (or 117900122789 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

Adding to 21222022100220 its reverse (2200122022212), we get a palindrome (23422144122432).

The spelling of 21222022100220 in words is "twenty-one trillion, two hundred twenty-two billion, twenty-two million, one hundred thousand, two hundred twenty".