1210221100221 has 32 divisors (see below), whose sum is σ = 1848709632000. Its totient is φ = 689844665664.

The previous prime is 1210221100219. The next prime is 1210221100229. The reversal of 1210221100221 is 1220011220121.

It is not a de Polignac number, because 1210221100221 - 2¹ = 1210221100219 is a prime.

It is a super-2 number, since 2×1210221100221² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1210221100221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1210221100229) by changing a digit.

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, 34002991 + ... + 34038563.

It is an arithmetic number, because the mean of its divisors is an integer number (57772176000).

Almost surely, 2^{1210221100221} is an apocalyptic number.

It is an amenable number.

1210221100221 is a deficient number, since it is larger than the sum of its proper divisors (638488531779).

1210221100221 is a wasteful number, since it uses less digits than its factorization.

1210221100221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39545.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 1210221100221 its reverse (1220011220121), we get a palindrome (2430232320342).

The spelling of 1210221100221 in words is "one trillion, two hundred ten billion, two hundred twenty-one million, one hundred thousand, two hundred twenty-one".