2121438427 has 2 divisors, whose sum is σ = 2121438428. Its totient is φ = 2121438426.

The previous prime is 2121438413. The next prime is 2121438457. The reversal of 2121438427 is 7248341212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2121438427 - 2⁷ = 2121438299 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2121438392 and 2121438401.

It is not a weakly prime, because it can be changed into another prime (2121438457) 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, 1060719213 + 1060719214.

It is an arithmetic number, because the mean of its divisors is an integer number (1060719214).

Almost surely, 2^2121438427 is an apocalyptic number.

2121438427 is a deficient number, since it is larger than the sum of its proper divisors (1).

2121438427 is an equidigital number, since it uses as much as digits as its factorization.

2121438427 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21504, while the sum is 34.

The square root of 2121438427 is about 46059.0754032254. The cubic root of 2121438427 is about 1284.9221342998.

Adding to 2121438427 its reverse (7248341212), we get a palindrome (9369779639).

The spelling of 2121438427 in words is "two billion, one hundred twenty-one million, four hundred thirty-eight thousand, four hundred twenty-seven".