102200111221 has 4 divisors (see below), whose sum is σ = 110061658252. Its totient is φ = 94338564192.

The previous prime is 102200111213. The next prime is 102200111227. The reversal of 102200111221 is 122111002201.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 122111002201 = 181 ⋅674646421.

It can be written as a sum of positive squares in 2 ways, for example, as 69043343121 + 33156768100 = 262761^2 + 182090^2 .

It is a cyclic number.

It is not a de Polignac number, because 102200111221 - 2³ = 102200111213 is a prime.

It is a super-2 number, since 2×102200111221² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (13), and also a Moran number because the ratio is a prime number: 7861547017 = 102200111221 / (1 + 0 + 2 + 2 + 0 + 0 + 1 + 1 + 1 + 2 + 2 + 1).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102200111227) 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, 3930773496 + ... + 3930773521.

It is an arithmetic number, because the mean of its divisors is an integer number (27515414563).

Almost surely, 2^102200111221 is an apocalyptic number.

It is an amenable number.

102200111221 is a deficient number, since it is larger than the sum of its proper divisors (7861547031).

102200111221 is an equidigital number, since it uses as much as digits as its factorization.

102200111221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7861547030.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 102200111221 its reverse (122111002201), we get a palindrome (224311113422).

The spelling of 102200111221 in words is "one hundred two billion, two hundred million, one hundred eleven thousand, two hundred twenty-one".