21283798 has 16 divisors (see below), whose sum is σ = 32431104. Its totient is φ = 10474920.

The previous prime is 21283777. The next prime is 21283841. The reversal of 21283798 is 89738212.

It is a self number, because there is not a number n which added to its sum of digits gives 21283798.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 57811 + ... + 58177.

It is an arithmetic number, because the mean of its divisors is an integer number (2026944).

Almost surely, 2^21283798 is an apocalyptic number.

21283798 is a deficient number, since it is larger than the sum of its proper divisors (11147306).

21283798 is a wasteful number, since it uses less digits than its factorization.

21283798 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 747.

The product of its digits is 48384, while the sum is 40.

The square root of 21283798 is about 4613.4366799600. The cubic root of 21283798 is about 277.1296816181.

The spelling of 21283798 in words is "twenty-one million, two hundred eighty-three thousand, seven hundred ninety-eight".