21222020222221 has 24 divisors (see below), whose sum is σ = 26989150618752. Its totient is φ = 16249402159200.

The previous prime is 21222020222213. The next prime is 21222020222233. The reversal of 21222020222221 is 12222202022212.

It is not a de Polignac number, because 21222020222221 - 2³ = 21222020222213 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21222020222192 and 21222020222201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21222020222281) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 121249185 + ... + 121424086.

It is an arithmetic number, because the mean of its divisors is an integer number (1124547942448).

Almost surely, 2^{21222020222221} is an apocalyptic number.

It is an amenable number.

21222020222221 is a deficient number, since it is larger than the sum of its proper divisors (5767130396531).

21222020222221 is a wasteful number, since it uses less digits than its factorization.

21222020222221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 242673353 (or 242673322 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 22.

Adding to 21222020222221 its reverse (12222202022212), we get a palindrome (33444222244433).

The spelling of 21222020222221 in words is "twenty-one trillion, two hundred twenty-two billion, twenty million, two hundred twenty-two thousand, two hundred twenty-one".