102222221221 has 4 divisors (see below), whose sum is σ = 102223691244. Its totient is φ = 102220751200.

The previous prime is 102222221207. The next prime is 102222221261. The reversal of 102222221221 is 122122222201.

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 64386525025 + 37835696196 = 253745^2 + 194514^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-102222221221 is a prime.

It is a super-2 number, since 2×102222221221² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102222221201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 625240 + ... + 771601.

It is an arithmetic number, because the mean of its divisors is an integer number (25555922811).

Almost surely, 2^102222221221 is an apocalyptic number.

It is an amenable number.

102222221221 is a deficient number, since it is larger than the sum of its proper divisors (1470023).

102222221221 is an equidigital number, since it uses as much as digits as its factorization.

102222221221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1470022.

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 102222221221 its reverse (122122222201), we get a palindrome (224344443422).

The spelling of 102222221221 in words is "one hundred two billion, two hundred twenty-two million, two hundred twenty-one thousand, two hundred twenty-one".