102212101222221 has 4 divisors (see below), whose sum is σ = 136282801629632. Its totient is φ = 68141400814812.

The previous prime is 102212101222151. The next prime is 102212101222237. The reversal of 102212101222221 is 122222101212201.

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 not a de Polignac number, because 102212101222221 - 2²¹ = 102212099125069 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102212101222261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17035350203701 + ... + 17035350203706.

It is an arithmetic number, because the mean of its divisors is an integer number (34070700407408).

Almost surely, 2^{102212101222221} is an apocalyptic number.

It is an amenable number.

102212101222221 is a deficient number, since it is larger than the sum of its proper divisors (34070700407411).

102212101222221 is an equidigital number, since it uses as much as digits as its factorization.

102212101222221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34070700407410.

The product of its (nonzero) digits is 256, while the sum is 21.

Adding to 102212101222221 its reverse (122222101212201), we get a palindrome (224434202434422).

The spelling of 102212101222221 in words is "one hundred two trillion, two hundred twelve billion, one hundred one million, two hundred twenty-two thousand, two hundred twenty-one".