21035314393 has 2 divisors, whose sum is σ = 21035314394. Its totient is φ = 21035314392.

The previous prime is 21035314381. The next prime is 21035314451. The reversal of 21035314393 is 39341353012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20314230784 + 721083609 = 142528^2 + 26853^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21035314393 is a prime.

It is a super-2 number, since 2×21035314393² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21035314693) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10517657196 + 10517657197.

It is an arithmetic number, because the mean of its divisors is an integer number (10517657197).

Almost surely, 2^21035314393 is an apocalyptic number.

It is an amenable number.

21035314393 is a deficient number, since it is larger than the sum of its proper divisors (1).

21035314393 is an equidigital number, since it uses as much as digits as its factorization.

21035314393 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 29160, while the sum is 34.

The spelling of 21035314393 in words is "twenty-one billion, thirty-five million, three hundred fourteen thousand, three hundred ninety-three".