210210221221 has 32 divisors (see below), whose sum is σ = 282537739008. Its totient is φ = 151040816640.

The previous prime is 210210221213. The next prime is 210210221231. The reversal of 210210221221 is 122122012012.

It is a happy number.

It is not a de Polignac number, because 210210221221 - 2³ = 210210221213 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 210210221195 and 210210221204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210210221231) 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 31 ways as a sum of consecutive naturals, for example, 843775 + ... + 1064131.

It is an arithmetic number, because the mean of its divisors is an integer number (8829304344).

Almost surely, 2^210210221221 is an apocalyptic number.

It is an amenable number.

210210221221 is a deficient number, since it is larger than the sum of its proper divisors (72327517787).

210210221221 is a wasteful number, since it uses less digits than its factorization.

210210221221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 221341.

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

Adding to 210210221221 its reverse (122122012012), we get a palindrome (332332233233).

The spelling of 210210221221 in words is "two hundred ten billion, two hundred ten million, two hundred twenty-one thousand, two hundred twenty-one".