210102221221 has 4 divisors (see below), whose sum is σ = 211044383872. Its totient is φ = 209160058572.

The previous prime is 210102221177. The next prime is 210102221237. The reversal of 210102221221 is 122122201012.

It is a happy number.

210102221221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 a de Polignac number, because none of the positive numbers 2^k-210102221221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 210102221195 and 210102221204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210102221291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 471080991 + ... + 471081436.

It is an arithmetic number, because the mean of its divisors is an integer number (52761095968).

Almost surely, 2^210102221221 is an apocalyptic number.

It is an amenable number.

210102221221 is a deficient number, since it is larger than the sum of its proper divisors (942162651).

210102221221 is an equidigital number, since it uses as much as digits as its factorization.

210102221221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 942162650.

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

Adding to 210102221221 its reverse (122122201012), we get a palindrome (332224422233).

The spelling of 210102221221 in words is "two hundred ten billion, one hundred two million, two hundred twenty-one thousand, two hundred twenty-one".