21343321427 has 2 divisors, whose sum is σ = 21343321428. Its totient is φ = 21343321426.

The previous prime is 21343321399. The next prime is 21343321583. The reversal of 21343321427 is 72412334312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21343321427 - 2¹⁴ = 21343305043 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21343321393 and 21343321402.

It is not a weakly prime, because it can be changed into another prime (21243321427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10671660713 + 10671660714.

It is an arithmetic number, because the mean of its divisors is an integer number (10671660714).

Almost surely, 2^21343321427 is an apocalyptic number.

21343321427 is a deficient number, since it is larger than the sum of its proper divisors (1).

21343321427 is an equidigital number, since it uses as much as digits as its factorization.

21343321427 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24192, while the sum is 32.

Adding to 21343321427 its reverse (72412334312), we get a palindrome (93755655739).

The spelling of 21343321427 in words is "twenty-one billion, three hundred forty-three million, three hundred twenty-one thousand, four hundred twenty-seven".