221200111221 has 4 divisors (see below), whose sum is σ = 294933481632. Its totient is φ = 147466740812.

The previous prime is 221200111201. The next prime is 221200111241. The reversal of 221200111221 is 122111002122.

221200111221 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, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (221200111201) and next prime (221200111241).

It is a cyclic number.

It is not a de Polignac number, because 221200111221 - 2¹³ = 221200103029 is a prime.

It is a super-2 number, since 2×221200111221² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 221200111221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221200111201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36866685201 + ... + 36866685206.

It is an arithmetic number, because the mean of its divisors is an integer number (73733370408).

Almost surely, 2^221200111221 is an apocalyptic number.

It is an amenable number.

221200111221 is a deficient number, since it is larger than the sum of its proper divisors (73733370411).

221200111221 is an equidigital number, since it uses as much as digits as its factorization.

221200111221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73733370410.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 221200111221 its reverse (122111002122), we get a palindrome (343311113343).

It can be divided in two parts, 2212001 and 11221, that added together give a palindrome (2223222).

The spelling of 221200111221 in words is "two hundred twenty-one billion, two hundred million, one hundred eleven thousand, two hundred twenty-one".