21842799 has 24 divisors (see below), whose sum is σ = 33707520. Its totient is φ = 12537360.

The previous prime is 21842797. The next prime is 21842813. The reversal of 21842799 is 99724812.

It is not a de Polignac number, because 21842799 - 2¹ = 21842797 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21842799.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21842797) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5314 + ... + 8480.

It is an arithmetic number, because the mean of its divisors is an integer number (1404480).

Almost surely, 2^21842799 is an apocalyptic number.

21842799 is a deficient number, since it is larger than the sum of its proper divisors (11864721).

21842799 is a wasteful number, since it uses less digits than its factorization.

21842799 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3211 (or 3200 counting only the distinct ones).

The product of its digits is 72576, while the sum is 42.

The square root of 21842799 is about 4673.6280339796. The cubic root of 21842799 is about 279.5349380237.

The spelling of 21842799 in words is "twenty-one million, eight hundred forty-two thousand, seven hundred ninety-nine".