2121200222101 has 4 divisors (see below), whose sum is σ = 2245976705772. Its totient is φ = 1996423738432.

The previous prime is 2121200222081. The next prime is 2121200222111. The reversal of 2121200222101 is 1012220021212.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1110391170001 + 1010809052100 = 1053751^2 + 1005390^2 .

It is not a de Polignac number, because 2121200222101 - 2²⁷ = 2121066004373 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121200222111) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 62388241810 + ... + 62388241843.

It is an arithmetic number, because the mean of its divisors is an integer number (561494176443).

Almost surely, 2^{2121200222101} is an apocalyptic number.

It is an amenable number.

2121200222101 is a deficient number, since it is larger than the sum of its proper divisors (124776483671).

2121200222101 is a wasteful number, since it uses less digits than its factorization.

2121200222101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124776483670.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 2121200222101 its reverse (1012220021212), we get a palindrome (3133420243313).

The spelling of 2121200222101 in words is "two trillion, one hundred twenty-one billion, two hundred million, two hundred twenty-two thousand, one hundred one".