21343321399 has 2 divisors, whose sum is σ = 21343321400. Its totient is φ = 21343321398.

The previous prime is 21343321393. The next prime is 21343321427. The reversal of 21343321399 is 99312334312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21343321399 - 2¹³ = 21343313207 is a prime.

It is a super-2 number, since 2×21343321399² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21343321393) 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, 10671660699 + 10671660700.

It is an arithmetic number, because the mean of its divisors is an integer number (10671660700).

Almost surely, 2^21343321399 is an apocalyptic number.

21343321399 is a deficient number, since it is larger than the sum of its proper divisors (1).

21343321399 is an equidigital number, since it uses as much as digits as its factorization.

21343321399 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 104976, while the sum is 40.

The spelling of 21343321399 in words is "twenty-one billion, three hundred forty-three million, three hundred twenty-one thousand, three hundred ninety-nine".