1210111201221 has 24 divisors (see below), whose sum is σ = 1751312898720. Its totient is φ = 742906397376.

The previous prime is 1210111201207. The next prime is 1210111201249. The reversal of 1210111201221 is 1221021110121.

It is a happy number.

It is not a de Polignac number, because 1210111201221 - 2¹⁷ = 1210111070149 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1210111201221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1210111201261) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2635786 + ... + 3060651.

It is an arithmetic number, because the mean of its divisors is an integer number (72971370780).

Almost surely, 2^{1210111201221} is an apocalyptic number.

It is an amenable number.

1210111201221 is a deficient number, since it is larger than the sum of its proper divisors (541201697499).

1210111201221 is a wasteful number, since it uses less digits than its factorization.

1210111201221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5696885 (or 5696872 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 1210111201221 its reverse (1221021110121), we get a palindrome (2431132311342).

The spelling of 1210111201221 in words is "one trillion, two hundred ten billion, one hundred eleven million, two hundred one thousand, two hundred twenty-one".