10221222111221 has 4 divisors (see below), whose sum is σ = 11150424121344. Its totient is φ = 9292020101100.

The previous prime is 10221222111209. The next prime is 10221222111241. The reversal of 10221222111221 is 12211122212201.

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 not a de Polignac number, because 10221222111221 - 2⁶ = 10221222111157 is a prime.

It is a super-2 number, since 2×10221222111221² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 10221222111193 and 10221222111202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10221222111241) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 464601005045 + ... + 464601005066.

It is an arithmetic number, because the mean of its divisors is an integer number (2787606030336).

Almost surely, 2^{10221222111221} is an apocalyptic number.

10221222111221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

10221222111221 is a deficient number, since it is larger than the sum of its proper divisors (929202010123).

10221222111221 is an equidigital number, since it uses as much as digits as its factorization.

10221222111221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 929202010122.

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

Adding to 10221222111221 its reverse (12211122212201), we get a palindrome (22432344323422).

The spelling of 10221222111221 in words is "ten trillion, two hundred twenty-one billion, two hundred twenty-two million, one hundred eleven thousand, two hundred twenty-one".