102112222221 has 6 divisors (see below), whose sum is σ = 147495432110. Its totient is φ = 68074814808.

The previous prime is 102112222217. The next prime is 102112222237. The reversal of 102112222221 is 122222211201.

It is a happy number.

102112222221 is a `hidden beast` number, since 10 + 211 + 2 + 222 + 221 = 666.

It can be written as a sum of positive squares in only one way, i.e., 58232446596 + 43879775625 = 241314^2 + 209475^2 .

It is not a de Polignac number, because 102112222221 - 2² = 102112222217 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 102112222194 and 102112222203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102112222271) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5672901226 + ... + 5672901243.

Almost surely, 2^102112222221 is an apocalyptic number.

It is an amenable number.

102112222221 is a deficient number, since it is larger than the sum of its proper divisors (45383209889).

102112222221 is a wasteful number, since it uses less digits than its factorization.

102112222221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11345802475 (or 11345802472 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 102112222221 its reverse (122222211201), we get a palindrome (224334433422).

The spelling of 102112222221 in words is "one hundred two billion, one hundred twelve million, two hundred twenty-two thousand, two hundred twenty-one".