102210221221 has 4 divisors (see below), whose sum is σ = 102440944512. Its totient is φ = 101979497932.

The previous prime is 102210221189. The next prime is 102210221261. The reversal of 102210221221 is 122122012201.

It is a happy number.

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 a cyclic number.

It is not a de Polignac number, because 102210221221 - 2⁵ = 102210221189 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 102210221195 and 102210221204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102210221261) 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, 115360981 + ... + 115361866.

It is an arithmetic number, because the mean of its divisors is an integer number (25610236128).

Almost surely, 2^102210221221 is an apocalyptic number.

It is an amenable number.

102210221221 is a deficient number, since it is larger than the sum of its proper divisors (230723291).

102210221221 is an equidigital number, since it uses as much as digits as its factorization.

102210221221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 230723290.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 102210221221 its reverse (122122012201), we get a palindrome (224332233422).

The spelling of 102210221221 in words is "one hundred two billion, two hundred ten million, two hundred twenty-one thousand, two hundred twenty-one".