2121231121 has 2 divisors, whose sum is σ = 2121231122. Its totient is φ = 2121231120.

The previous prime is 2121231059. The next prime is 2121231163. The reversal of 2121231121 is 1211321212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1254576400 + 866654721 = 35420^2 + 29439^2 .

It is a cyclic number.

It is not a de Polignac number, because 2121231121 - 2¹⁵ = 2121198353 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2121231095 and 2121231104.

It is not a weakly prime, because it can be changed into another prime (2121231521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060615560 + 1060615561.

It is an arithmetic number, because the mean of its divisors is an integer number (1060615561).

Almost surely, 2^2121231121 is an apocalyptic number.

It is an amenable number.

2121231121 is a deficient number, since it is larger than the sum of its proper divisors (1).

2121231121 is an equidigital number, since it uses as much as digits as its factorization.

2121231121 is an odious number, because the sum of its binary digits is odd.

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

The square root of 2121231121 is about 46056.8249122755. The cubic root of 2121231121 is about 1284.8802789338.

Adding to 2121231121 its reverse (1211321212), we get a palindrome (3332552333).

Subtracting from 2121231121 its reverse (1211321212), we obtain a palindrome (909909909).

The spelling of 2121231121 in words is "two billion, one hundred twenty-one million, two hundred thirty-one thousand, one hundred twenty-one".