21284798 has 8 divisors (see below), whose sum is σ = 33315408. Its totient is φ = 10179664.

The previous prime is 21284797. The next prime is 21284801. The reversal of 21284798 is 89748212.

21284798 is nontrivially palindromic in base 7.

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

It is a super-3 number, since 3×21284798³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21284797) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 231311 + ... + 231402.

It is an arithmetic number, because the mean of its divisors is an integer number (4164426).

Almost surely, 2^21284798 is an apocalyptic number.

21284798 is a deficient number, since it is larger than the sum of its proper divisors (12030610).

21284798 is a wasteful number, since it uses less digits than its factorization.

21284798 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 462738.

The product of its digits is 64512, while the sum is 41.

The square root of 21284798 is about 4613.5450577620. The cubic root of 21284798 is about 277.1340217793.

The spelling of 21284798 in words is "twenty-one million, two hundred eighty-four thousand, seven hundred ninety-eight".