2121321121 has 4 divisors (see below), whose sum is σ = 2137514544. Its totient is φ = 2105127700.

The previous prime is 2121321113. The next prime is 2121321143. The reversal of 2121321121 is 1211231212.

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 2121321121 - 2³ = 2121321113 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2121321095 and 2121321104.

It is not an unprimeable number, because it can be changed into a prime (2121321151) 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, 8096515 + ... + 8096776.

It is an arithmetic number, because the mean of its divisors is an integer number (534378636).

Almost surely, 2^2121321121 is an apocalyptic number.

It is an amenable number.

2121321121 is a deficient number, since it is larger than the sum of its proper divisors (16193423).

2121321121 is a wasteful number, since it uses less digits than its factorization.

2121321121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16193422.

The product of its digits is 48, while the sum is 16.

The square root of 2121321121 is about 46057.8019558033. The cubic root of 2121321121 is about 1284.8984503923.

Adding to 2121321121 its reverse (1211231212), we get a palindrome (3332552333).

The spelling of 2121321121 in words is "two billion, one hundred twenty-one million, three hundred twenty-one thousand, one hundred twenty-one".