21276809798 has 8 divisors (see below), whose sum is σ = 32299735608. Its totient is φ = 10510231264.

The previous prime is 21276809789. The next prime is 21276809809. The reversal of 21276809798 is 89790867212.

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

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, 64086611 + ... + 64086942.

It is an arithmetic number, because the mean of its divisors is an integer number (4037466951).

Almost surely, 2^21276809798 is an apocalyptic number.

21276809798 is a deficient number, since it is larger than the sum of its proper divisors (11022925810).

21276809798 is a wasteful number, since it uses less digits than its factorization.

21276809798 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128173638.

The product of its (nonzero) digits is 6096384, while the sum is 59.

The spelling of 21276809798 in words is "twenty-one billion, two hundred seventy-six million, eight hundred nine thousand, seven hundred ninety-eight".