21203303293 has 2 divisors, whose sum is σ = 21203303294. Its totient is φ = 21203303292.

The previous prime is 21203303221. The next prime is 21203303309. The reversal of 21203303293 is 39230330212.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17355954564 + 3847348729 = 131742^2 + 62027^2 .

It is a cyclic number.

It is not a de Polignac number, because 21203303293 - 2³³ = 12613368701 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21203303393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10601651646 + 10601651647.

It is an arithmetic number, because the mean of its divisors is an integer number (10601651647).

Almost surely, 2^21203303293 is an apocalyptic number.

It is an amenable number.

21203303293 is a deficient number, since it is larger than the sum of its proper divisors (1).

21203303293 is an equidigital number, since it uses as much as digits as its factorization.

21203303293 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5832, while the sum is 28.

The spelling of 21203303293 in words is "twenty-one billion, two hundred three million, three hundred three thousand, two hundred ninety-three".