21325434439 has 2 divisors, whose sum is σ = 21325434440. Its totient is φ = 21325434438.

The previous prime is 21325434437. The next prime is 21325434463. The reversal of 21325434439 is 93443452312.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21325434439 - 2¹ = 21325434437 is a prime.

Together with 21325434437, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21325434437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10662717219 + 10662717220.

It is an arithmetic number, because the mean of its divisors is an integer number (10662717220).

Almost surely, 2^21325434439 is an apocalyptic number.

21325434439 is a deficient number, since it is larger than the sum of its proper divisors (1).

21325434439 is an equidigital number, since it uses as much as digits as its factorization.

21325434439 is an evil number, because the sum of its binary digits is even.

The product of its digits is 311040, while the sum is 40.

The spelling of 21325434439 in words is "twenty-one billion, three hundred twenty-five million, four hundred thirty-four thousand, four hundred thirty-nine".