221201100212210 has 32 divisors (see below), whose sum is σ = 399087735343920. Its totient is φ = 88274723125248.

The previous prime is 221201100212093. The next prime is 221201100212219. The reversal of 221201100212210 is 12212001102122.

It can be written as a sum of positive squares in 8 ways, for example, as 28582592220361 + 192618507991849 = 5346269^2 + 13878707^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (221201100212219) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 304855004 + ... + 305579736.

Almost surely, 2^{221201100212210} is an apocalyptic number.

221201100212210 is a deficient number, since it is larger than the sum of its proper divisors (177886635131710).

221201100212210 is a wasteful number, since it uses less digits than its factorization.

221201100212210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 795662.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 221201100212210 its reverse (12212001102122), we get a palindrome (233413101314332).

The spelling of 221201100212210 in words is "two hundred twenty-one trillion, two hundred one billion, one hundred million, two hundred twelve thousand, two hundred ten".