10111221200221 has 4 divisors (see below), whose sum is σ = 10117137656700. Its totient is φ = 10105304743744.

The previous prime is 10111221200209. The next prime is 10111221200239. The reversal of 10111221200221 is 12200212211101.

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 5433495732196 + 4677725468025 = 2330986^2 + 2162805^2 .

It is a cyclic number.

It is not a de Polignac number, because 10111221200221 - 2²⁹ = 10110684329309 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 10111221200195 and 10111221200204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10111221200281) 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, 2958225676 + ... + 2958229093.

It is an arithmetic number, because the mean of its divisors is an integer number (2529284414175).

Almost surely, 2^{10111221200221} is an apocalyptic number.

It is an amenable number.

10111221200221 is a deficient number, since it is larger than the sum of its proper divisors (5916456479).

10111221200221 is an equidigital number, since it uses as much as digits as its factorization.

10111221200221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5916456478.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 10111221200221 its reverse (12200212211101), we get a palindrome (22311433411322).

The spelling of 10111221200221 in words is "ten trillion, one hundred eleven billion, two hundred twenty-one million, two hundred thousand, two hundred twenty-one".