21400069393 has 2 divisors, whose sum is σ = 21400069394. Its totient is φ = 21400069392.

The previous prime is 21400069367. The next prime is 21400069403. The reversal of 21400069393 is 39396000412.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10764685009 + 10635384384 = 103753^2 + 103128^2 .

It is a cyclic number.

It is not a de Polignac number, because 21400069393 - 2⁹ = 21400068881 is a prime.

It is not a weakly prime, because it can be changed into another prime (21400061393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10700034696 + 10700034697.

It is an arithmetic number, because the mean of its divisors is an integer number (10700034697).

Almost surely, 2^21400069393 is an apocalyptic number.

It is an amenable number.

21400069393 is a deficient number, since it is larger than the sum of its proper divisors (1).

21400069393 is an equidigital number, since it uses as much as digits as its factorization.

21400069393 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 34992, while the sum is 37.

The spelling of 21400069393 in words is "twenty-one billion, four hundred million, sixty-nine thousand, three hundred ninety-three".