21330214642493 has 2 divisors, whose sum is σ = 21330214642494. Its totient is φ = 21330214642492.

The previous prime is 21330214642439. The next prime is 21330214642519. The reversal of 21330214642493 is 39424641203312.

Together with previous prime (21330214642439) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13099897106884 + 8230317535609 = 3619378^2 + 2868853^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21330214642493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21330214642393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10665107321246 + 10665107321247.

It is an arithmetic number, because the mean of its divisors is an integer number (10665107321247).

Almost surely, 2^{21330214642493} is an apocalyptic number.

It is an amenable number.

21330214642493 is a deficient number, since it is larger than the sum of its proper divisors (1).

21330214642493 is an equidigital number, since it uses as much as digits as its factorization.

21330214642493 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 746496, while the sum is 44.

The spelling of 21330214642493 in words is "twenty-one trillion, three hundred thirty billion, two hundred fourteen million, six hundred forty-two thousand, four hundred ninety-three".