21222112021222 has 8 divisors (see below), whose sum is σ = 36380763464976. Its totient is φ = 9095190866232.

The previous prime is 21222112021213. The next prime is 21222112021247. The reversal of 21222112021222 is 22212021122212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 21222112021193 and 21222112021202.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 757932572173 + ... + 757932572200.

It is an arithmetic number, because the mean of its divisors is an integer number (4547595433122).

Almost surely, 2^{21222112021222} is an apocalyptic number.

21222112021222 is a deficient number, since it is larger than the sum of its proper divisors (15158651443754).

21222112021222 is a wasteful number, since it uses less digits than its factorization.

21222112021222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1515865144382.

The product of its (nonzero) digits is 512, while the sum is 22.

Adding to 21222112021222 its reverse (22212021122212), we get a palindrome (43434133143434).

The spelling of 21222112021222 in words is "twenty-one trillion, two hundred twenty-two billion, one hundred twelve million, twenty-one thousand, two hundred twenty-two".