221201212210 has 64 divisors (see below), whose sum is σ = 441257601024. Its totient is φ = 79161508800.

The previous prime is 221201212189. The next prime is 221201212247. The reversal of 221201212210 is 12212102122.

It is a happy number.

It is an unprimeable number.

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, 8115505 + ... + 8142715.

It is an arithmetic number, because the mean of its divisors is an integer number (6894650016).

Almost surely, 2^221201212210 is an apocalyptic number.

221201212210 is a deficient number, since it is larger than the sum of its proper divisors (220056388814).

221201212210 is a wasteful number, since it uses less digits than its factorization.

221201212210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28399.

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

Adding to 221201212210 its reverse (12212102122), we get a palindrome (233413314332).

It can be divided in two parts, 2212012 and 12210, that added together give a palindrome (2224222).

The spelling of 221201212210 in words is "two hundred twenty-one billion, two hundred one million, two hundred twelve thousand, two hundred ten".