102220211221 has 4 divisors (see below), whose sum is σ = 102227306092. Its totient is φ = 102213116352.

The previous prime is 102220211209. The next prime is 102220211257. The reversal of 102220211221 is 122112022201.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 64001916196 + 38218295025 = 252986^2 + 195495^2 .

It is a cyclic number.

It is not a de Polignac number, because 102220211221 - 2⁵ = 102220211189 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 102220211195 and 102220211204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102220211021) 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, 3525780 + ... + 3554653.

It is an arithmetic number, because the mean of its divisors is an integer number (25556826523).

Almost surely, 2^102220211221 is an apocalyptic number.

It is an amenable number.

102220211221 is a deficient number, since it is larger than the sum of its proper divisors (7094871).

102220211221 is an equidigital number, since it uses as much as digits as its factorization.

102220211221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7094870.

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

Adding to 102220211221 its reverse (122112022201), we get a palindrome (224332233422).

The spelling of 102220211221 in words is "one hundred two billion, two hundred twenty million, two hundred eleven thousand, two hundred twenty-one".