21110798 has 4 divisors (see below), whose sum is σ = 31666200. Its totient is φ = 10555398.

The previous prime is 21110737. The next prime is 21110813. The reversal of 21110798 is 89701112.

It is a semiprime because it is the product of two primes.

It is a self number, because there is not a number n which added to its sum of digits gives 21110798.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5277698 + ... + 5277701.

It is an arithmetic number, because the mean of its divisors is an integer number (7916550).

Almost surely, 2^21110798 is an apocalyptic number.

21110798 is a deficient number, since it is larger than the sum of its proper divisors (10555402).

21110798 is a wasteful number, since it uses less digits than its factorization.

21110798 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10555401.

The product of its (nonzero) digits is 1008, while the sum is 29.

The square root of 21110798 is about 4594.6488440359. The cubic root of 21110798 is about 276.3767783468.

The spelling of 21110798 in words is "twenty-one million, one hundred ten thousand, seven hundred ninety-eight".