2121331939 has 2 divisors, whose sum is σ = 2121331940. Its totient is φ = 2121331938.

The previous prime is 2121331921. The next prime is 2121331951. The reversal of 2121331939 is 9391331212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2121331939 - 2⁵ = 2121331907 is a prime.

It is not a weakly prime, because it can be changed into another prime (2121331909) 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, 1060665969 + 1060665970.

It is an arithmetic number, because the mean of its divisors is an integer number (1060665970).

Almost surely, 2^2121331939 is an apocalyptic number.

2121331939 is a deficient number, since it is larger than the sum of its proper divisors (1).

2121331939 is an equidigital number, since it uses as much as digits as its factorization.

2121331939 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8748, while the sum is 34.

The square root of 2121331939 is about 46057.9193950400. The cubic root of 2121331939 is about 1284.9006345670.

The spelling of 2121331939 in words is "two billion, one hundred twenty-one million, three hundred thirty-one thousand, nine hundred thirty-nine".