21143413393 has 2 divisors, whose sum is σ = 21143413394. Its totient is φ = 21143413392.

The previous prime is 21143413391. The next prime is 21143413429. The reversal of 21143413393 is 39331434112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15757027729 + 5386385664 = 125527^2 + 73392^2 .

It is a cyclic number.

It is not a de Polignac number, because 21143413393 - 2¹ = 21143413391 is a prime.

Together with 21143413391, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (21143413391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10571706696 + 10571706697.

It is an arithmetic number, because the mean of its divisors is an integer number (10571706697).

Almost surely, 2^21143413393 is an apocalyptic number.

It is an amenable number.

21143413393 is a deficient number, since it is larger than the sum of its proper divisors (1).

21143413393 is an equidigital number, since it uses as much as digits as its factorization.

21143413393 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23328, while the sum is 34.

The spelling of 21143413393 in words is "twenty-one billion, one hundred forty-three million, four hundred thirteen thousand, three hundred ninety-three".