102222111221 has 4 divisors (see below), whose sum is σ = 102500645952. Its totient is φ = 101943576492.

The previous prime is 102222111217. The next prime is 102222111241. The reversal of 102222111221 is 122111222201.

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, and also an emirpimes, since its reverse is a distinct semiprime: 122111222201 = 63799 ⋅1913999.

It is a cyclic number.

It is not a de Polignac number, because 102222111221 - 2² = 102222111217 is a prime.

It is a super-2 number, since 2×102222111221² (a number of 23 digits) contains 22 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 102222111221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102222111241) 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, 139266815 + ... + 139267548.

It is an arithmetic number, because the mean of its divisors is an integer number (25625161488).

Almost surely, 2^102222111221 is an apocalyptic number.

It is an amenable number.

102222111221 is a deficient number, since it is larger than the sum of its proper divisors (278534731).

102222111221 is an equidigital number, since it uses as much as digits as its factorization.

102222111221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 278534730.

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

Adding to 102222111221 its reverse (122111222201), we get a palindrome (224333333422).

The spelling of 102222111221 in words is "one hundred two billion, two hundred twenty-two million, one hundred eleven thousand, two hundred twenty-one".