1210211100221 has 8 divisors (see below), whose sum is σ = 1264337991000. Its totient is φ = 1156910574400.

The previous prime is 1210211100209. The next prime is 1210211100239. The reversal of 1210211100221 is 1220011120121.

It can be written as a sum of positive squares in 4 ways, for example, as 522656702500 + 687554397721 = 722950^2 + 829189^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1210211100221 - 2¹⁰ = 1210211099197 is a prime.

It is a super-2 number, since 2×1210211100221² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1210211100196 and 1210211100205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1210211105221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 206588246 + ... + 206594103.

It is an arithmetic number, because the mean of its divisors is an integer number (158042248875).

Almost surely, 2^{1210211100221} is an apocalyptic number.

It is an amenable number.

1210211100221 is a deficient number, since it is larger than the sum of its proper divisors (54126890779).

1210211100221 is a wasteful number, since it uses less digits than its factorization.

1210211100221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 413182479.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 1210211100221 its reverse (1220011120121), we get a palindrome (2430222220342).

The spelling of 1210211100221 in words is "one trillion, two hundred ten billion, two hundred eleven million, one hundred thousand, two hundred twenty-one".