221220212210 has 16 divisors (see below), whose sum is σ = 401236051392. Its totient is φ = 87812602800.

The previous prime is 221220212201. The next prime is 221220212219. The reversal of 221220212210 is 12212022122.

It is a happy number.

221220212210 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (221220212201) and next prime (221220212219).

It is not an unprimeable number, because it can be changed into a prime (221220212219) 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 7 ways as a sum of consecutive naturals, for example, 84433886 + ... + 84436505.

It is an arithmetic number, because the mean of its divisors is an integer number (25077253212).

Almost surely, 2^221220212210 is an apocalyptic number.

221220212210 is a deficient number, since it is larger than the sum of its proper divisors (180015839182).

221220212210 is a wasteful number, since it uses less digits than its factorization.

221220212210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 168870529.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 221220212210 its reverse (12212022122), we get a palindrome (233432234332).

The spelling of 221220212210 in words is "two hundred twenty-one billion, two hundred twenty million, two hundred twelve thousand, two hundred ten".