21029798327798 has 8 divisors (see below), whose sum is σ = 33971212683408. Its totient is φ = 9706060766664.

The previous prime is 21029798327773. The next prime is 21029798327821. The reversal of 21029798327798 is 89772389792012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 404419198586 + ... + 404419198637.

It is an arithmetic number, because the mean of its divisors is an integer number (4246401585426).

Almost surely, 2^{21029798327798} is an apocalyptic number.

21029798327798 is a deficient number, since it is larger than the sum of its proper divisors (12941414355610).

21029798327798 is a wasteful number, since it uses less digits than its factorization.

21029798327798 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 808838397238.

The product of its (nonzero) digits is 384072192, while the sum is 74.

The spelling of 21029798327798 in words is "twenty-one trillion, twenty-nine billion, seven hundred ninety-eight million, three hundred twenty-seven thousand, seven hundred ninety-eight".