2121331447 has 2 divisors, whose sum is σ = 2121331448. Its totient is φ = 2121331446.

The previous prime is 2121331393. The next prime is 2121331483. The reversal of 2121331447 is 7441331212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2121331447 - 2¹⁹ = 2120807159 is a prime.

It is a super-2 number, since 2×2121331447² = 9000094216062227618, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2121331847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060665723 + 1060665724.

It is an arithmetic number, because the mean of its divisors is an integer number (1060665724).

Almost surely, 2^2121331447 is an apocalyptic number.

2121331447 is a deficient number, since it is larger than the sum of its proper divisors (1).

2121331447 is an equidigital number, since it uses as much as digits as its factorization.

2121331447 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4032, while the sum is 28.

The square root of 2121331447 is about 46057.9140539387. The cubic root of 2121331447 is about 1284.9005352314.

Adding to 2121331447 its reverse (7441331212), we get a palindrome (9562662659).

The spelling of 2121331447 in words is "two billion, one hundred twenty-one million, three hundred thirty-one thousand, four hundred forty-seven".