21088964798 has 16 divisors (see below), whose sum is σ = 34652415600. Its totient is φ = 9546115200.

The previous prime is 21088964773. The next prime is 21088964801. The reversal of 21088964798 is 89746988012.

It is a self number, because there is not a number n which added to its sum of digits gives 21088964798.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1983473 + ... + 1994076.

It is an arithmetic number, because the mean of its divisors is an integer number (2165775975).

Almost surely, 2^21088964798 is an apocalyptic number.

21088964798 is a deficient number, since it is larger than the sum of its proper divisors (13563450802).

21088964798 is a wasteful number, since it uses less digits than its factorization.

21088964798 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3977803.

The product of its (nonzero) digits is 13934592, while the sum is 62.

The spelling of 21088964798 in words is "twenty-one billion, eighty-eight million, nine hundred sixty-four thousand, seven hundred ninety-eight".