1220102210221 has 4 divisors (see below), whose sum is σ = 1220121431100. Its totient is φ = 1220082989344.

The previous prime is 1220102210153. The next prime is 1220102210237. The reversal of 1220102210221 is 1220122010221.

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 544475748996 + 675626461225 = 737886^2 + 821965^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1220102210221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1220102210195 and 1220102210204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220102210291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9514906 + ... + 9642283.

It is an arithmetic number, because the mean of its divisors is an integer number (305030357775).

Almost surely, 2^{1220102210221} is an apocalyptic number.

It is an amenable number.

1220102210221 is a deficient number, since it is larger than the sum of its proper divisors (19220879).

1220102210221 is an equidigital number, since it uses as much as digits as its factorization.

1220102210221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19220878.

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

Adding to 1220102210221 its reverse (1220122010221), we get a palindrome (2440224220442).

The spelling of 1220102210221 in words is "one trillion, two hundred twenty billion, one hundred two million, two hundred ten thousand, two hundred twenty-one".