21829798 has 4 divisors (see below), whose sum is σ = 32744700. Its totient is φ = 10914898.

The previous prime is 21829793. The next prime is 21829817. The reversal of 21829798 is 89792812.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21829793) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5457448 + ... + 5457451.

It is an arithmetic number, because the mean of its divisors is an integer number (8186175).

Almost surely, 2^21829798 is an apocalyptic number.

21829798 is a deficient number, since it is larger than the sum of its proper divisors (10914902).

21829798 is a wasteful number, since it uses less digits than its factorization.

21829798 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10914901.

The product of its digits is 145152, while the sum is 46.

The square root of 21829798 is about 4672.2369374851. The cubic root of 21829798 is about 279.4794665765.

The spelling of 21829798 in words is "twenty-one million, eight hundred twenty-nine thousand, seven hundred ninety-eight".