21222021022021 has 16 divisors (see below), whose sum is σ = 22110887518720. Its totient is φ = 20345978727360.

The previous prime is 21222021022019. The next prime is 21222021022051. The reversal of 21222021022021 is 12022012022212.

It is a cyclic number.

It is not a de Polignac number, because 21222021022021 - 2¹ = 21222021022019 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21222021022021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21222021022001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22284406 + ... + 23217208.

It is an arithmetic number, because the mean of its divisors is an integer number (1381930469920).

Almost surely, 2^{21222021022021} is an apocalyptic number.

It is an amenable number.

21222021022021 is a deficient number, since it is larger than the sum of its proper divisors (888866496699).

21222021022021 is a wasteful number, since it uses less digits than its factorization.

21222021022021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 939676.

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 21222021022021 its reverse (12022012022212), we get a palindrome (33244033044233).

The spelling of 21222021022021 in words is "twenty-one trillion, two hundred twenty-two billion, twenty-one million, twenty-two thousand, twenty-one".