2102201221121 has 4 divisors (see below), whose sum is σ = 2108552282544. Its totient is φ = 2095850159700.

The previous prime is 2102201221111. The next prime is 2102201221187. The reversal of 2102201221121 is 1211221022012.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2102201221121 - 2¹⁴ = 2102201204737 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2102201221121.

It is not an unprimeable number, because it can be changed into a prime (2102201221111) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 3175530215 + ... + 3175530876.

It is an arithmetic number, because the mean of its divisors is an integer number (527138070636).

Almost surely, 2^{2102201221121} is an apocalyptic number.

It is an amenable number.

2102201221121 is a deficient number, since it is larger than the sum of its proper divisors (6351061423).

2102201221121 is an equidigital number, since it uses as much as digits as its factorization.

2102201221121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6351061422.

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

Adding to 2102201221121 its reverse (1211221022012), we get a palindrome (3313422243133).

It can be divided in two parts, 210220 and 1221121, that added together give a palindrome (1431341).

The spelling of 2102201221121 in words is "two trillion, one hundred two billion, two hundred one million, two hundred twenty-one thousand, one hundred twenty-one".