21020222112222 has 64 divisors (see below), whose sum is σ = 42720846128640. Its totient is φ = 6894263465856.

The previous prime is 21020222112187. The next prime is 21020222112247. The reversal of 21020222112222 is 22221122202012.

It is a super-3 number, since 3×21020222112222³ (a number of 41 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 257689479 + ... + 257771037.

It is an arithmetic number, because the mean of its divisors is an integer number (667513220760).

Almost surely, 2^{21020222112222} is an apocalyptic number.

21020222112222 is an abundant number, since it is smaller than the sum of its proper divisors (21700624016418).

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

21020222112222 is a wasteful number, since it uses less digits than its factorization.

21020222112222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84385.

The product of its (nonzero) digits is 512, while the sum is 21.

Adding to 21020222112222 its reverse (22221122202012), we get a palindrome (43241344314234).

The spelling of 21020222112222 in words is "twenty-one trillion, twenty billion, two hundred twenty-two million, one hundred twelve thousand, two hundred twenty-two".