10221100212221 has 4 divisors (see below), whose sum is σ = 10237666015452. Its totient is φ = 10204534408992.

The previous prime is 10221100212203. The next prime is 10221100212251. The reversal of 10221100212221 is 12221200112201.

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 5400111506596 + 4820988705625 = 2323814^2 + 2195675^2 .

It is a cyclic number.

It is not a de Polignac number, because 10221100212221 - 2¹⁰ = 10221100211197 is a prime.

It is a super-4 number, since 4×10221100212221⁴ (a number of 53 digits) contains 4444 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 10221100212221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10221100212251) 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, 8282900690 + ... + 8282901923.

It is an arithmetic number, because the mean of its divisors is an integer number (2559416503863).

Almost surely, 2^{10221100212221} is an apocalyptic number.

It is an amenable number.

10221100212221 is a deficient number, since it is larger than the sum of its proper divisors (16565803231).

10221100212221 is an equidigital number, since it uses as much as digits as its factorization.

10221100212221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16565803230.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 10221100212221 its reverse (12221200112201), we get a palindrome (22442300324422).

The spelling of 10221100212221 in words is "ten trillion, two hundred twenty-one billion, one hundred million, two hundred twelve thousand, two hundred twenty-one".