2121200001121 has 4 divisors (see below), whose sum is σ = 2140660551700. Its totient is φ = 2101739450544.

The previous prime is 2121200001091. The next prime is 2121200001131. The reversal of 2121200001121 is 1211000021212.

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 1410011378721 + 711188622400 = 1187439^2 + 843320^2 .

It is a cyclic number.

It is not a de Polignac number, because 2121200001121 - 2¹⁹ = 2121199476833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2121200001131) 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, 9730275126 + ... + 9730275343.

It is an arithmetic number, because the mean of its divisors is an integer number (535165137925).

Almost surely, 2^{2121200001121} is an apocalyptic number.

It is an amenable number.

2121200001121 is a deficient number, since it is larger than the sum of its proper divisors (19460550579).

2121200001121 is a wasteful number, since it uses less digits than its factorization.

2121200001121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19460550578.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 2121200001121 its reverse (1211000021212), we get a palindrome (3332200022333).

The spelling of 2121200001121 in words is "two trillion, one hundred twenty-one billion, two hundred million, one thousand, one hundred twenty-one".