21222110112221 has 4 divisors (see below), whose sum is σ = 21322688833344. Its totient is φ = 21121531391100.

The previous prime is 21222110112193. The next prime is 21222110112251. The reversal of 21222110112221 is 12221101122212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21222110112221 - 2²² = 21222105917917 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21222110112193 and 21222110112202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21222110112251) 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 3 ways as a sum of consecutive naturals, for example, 50289360245 + ... + 50289360666.

It is an arithmetic number, because the mean of its divisors is an integer number (5330672208336).

Almost surely, 2^{21222110112221} is an apocalyptic number.

It is an amenable number.

21222110112221 is a deficient number, since it is larger than the sum of its proper divisors (100578721123).

21222110112221 is a wasteful number, since it uses less digits than its factorization.

21222110112221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100578721122.

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 21222110112221 its reverse (12221101122212), we get a palindrome (33443211234433).

It can be divided in two parts, 2 and 1222110112221, that multiplied together give a palindrome (2444220224442).

The spelling of 21222110112221 in words is "twenty-one trillion, two hundred twenty-two billion, one hundred ten million, one hundred twelve thousand, two hundred twenty-one".