221212202112210 has 64 divisors (see below), whose sum is σ = 558853727241600. Its totient is φ = 55885003080192.

The previous prime is 221212202112127. The next prime is 221212202112259. The reversal of 221212202112210 is 12211202212122.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 277566576 + ... + 278362404.

It is an arithmetic number, because the mean of its divisors is an integer number (8732089488150).

Almost surely, 2^{221212202112210} is an apocalyptic number.

221212202112210 is an abundant number, since it is smaller than the sum of its proper divisors (337641525129390).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221212202112210 is a wasteful number, since it uses less digits than its factorization.

221212202112210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1283515.

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

Adding to 221212202112210 its reverse (12211202212122), we get a palindrome (233423404324332).

The spelling of 221212202112210 in words is "two hundred twenty-one trillion, two hundred twelve billion, two hundred two million, one hundred twelve thousand, two hundred ten".