21204303243398 has 64 divisors (see below), whose sum is σ = 38019899750400. Its totient is φ = 8755320752640.

The previous prime is 21204303243359. The next prime is 21204303243437. The reversal of 21204303243398 is 89334230340212.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21204303243359) and next prime (21204303243437).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 29130761 + ... + 29849787.

It is an arithmetic number, because the mean of its divisors is an integer number (594060933600).

Almost surely, 2^{21204303243398} is an apocalyptic number.

21204303243398 is a deficient number, since it is larger than the sum of its proper divisors (16815596507002).

21204303243398 is a wasteful number, since it uses less digits than its factorization.

21204303243398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 721805.

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

The spelling of 21204303243398 in words is "twenty-one trillion, two hundred four billion, three hundred three million, two hundred forty-three thousand, three hundred ninety-eight".