2121201121 has 4 divisors (see below), whose sum is σ = 2284370452. Its totient is φ = 1958031792.

The previous prime is 2121201119. The next prime is 2121201161. The reversal of 2121201121 is 1211021212.

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 609546721 + 1511654400 = 24689^2 + 38880^2 .

It is a cyclic number.

It is not a de Polignac number, because 2121201121 - 2¹ = 2121201119 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13), and also a Moran number because the ratio is a prime number: 163169317 = 2121201121 / (2 + 1 + 2 + 1 + 2 + 0 + 1 + 1 + 2 + 1).

It is not an unprimeable number, because it can be changed into a prime (2121201161) 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, 81584646 + ... + 81584671.

It is an arithmetic number, because the mean of its divisors is an integer number (571092613).

Almost surely, 2^2121201121 is an apocalyptic number.

It is an amenable number.

2121201121 is a deficient number, since it is larger than the sum of its proper divisors (163169331).

2121201121 is a wasteful number, since it uses less digits than its factorization.

2121201121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163169330.

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

The square root of 2121201121 is about 46056.4992264935. The cubic root of 2121201121 is about 1284.8742216668.

Adding to 2121201121 its reverse (1211021212), we get a palindrome (3332222333).

The spelling of 2121201121 in words is "two billion, one hundred twenty-one million, two hundred one thousand, one hundred twenty-one".