221212120110210 has 48 divisors (see below), whose sum is σ = 576485970652800. Its totient is φ = 58853031171360.

The previous prime is 221212120110187. The next prime is 221212120110253. The reversal of 221212120110210 is 12011021212122.

221212120110210 is a `hidden beast` number, since 2 + 212 + 12 + 120 + 110 + 210 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

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 23 ways as a sum of consecutive naturals, for example, 2851367760 + ... + 2851445339.

It is an arithmetic number, because the mean of its divisors is an integer number (12010124388600).

Almost surely, 2^{221212120110210} is an apocalyptic number.

221212120110210 is an abundant number, since it is smaller than the sum of its proper divisors (355273850542590).

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

221212120110210 is a wasteful number, since it uses less digits than its factorization.

221212120110210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5702813543 (or 5702813540 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 221212120110210 its reverse (12011021212122), we get a palindrome (233223141322332).

The spelling of 221212120110210 in words is "two hundred twenty-one trillion, two hundred twelve billion, one hundred twenty million, one hundred ten thousand, two hundred ten".