10221222212221 has 4 divisors (see below), whose sum is σ = 10223269327612. Its totient is φ = 10219175096832.

The previous prime is 10221222212207. The next prime is 10221222212261. The reversal of 10221222212221 is 12221222212201.

10221222212221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3768296264100 + 6452925948121 = 1941210^2 + 2540261^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-10221222212221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 10221222212192 and 10221222212201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10221222212261) 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, 1023550206 + ... + 1023560191.

It is an arithmetic number, because the mean of its divisors is an integer number (2555817331903).

Almost surely, 2^{10221222212221} is an apocalyptic number.

It is an amenable number.

10221222212221 is a deficient number, since it is larger than the sum of its proper divisors (2047115391).

10221222212221 is an equidigital number, since it uses as much as digits as its factorization.

10221222212221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2047115390.

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

Adding to 10221222212221 its reverse (12221222212201), we get a palindrome (22442444424422).

The spelling of 10221222212221 in words is "ten trillion, two hundred twenty-one billion, two hundred twenty-two million, two hundred twelve thousand, two hundred twenty-one".