21799383 has 4 divisors (see below), whose sum is σ = 29065848. Its totient is φ = 14532920.

The previous prime is 21799381. The next prime is 21799391. The reversal of 21799383 is 38399712.

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

It is a cyclic number.

It is not a de Polignac number, because 21799383 - 2¹ = 21799381 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21799381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3633228 + ... + 3633233.

It is an arithmetic number, because the mean of its divisors is an integer number (7266462).

Almost surely, 2^21799383 is an apocalyptic number.

21799383 is a deficient number, since it is larger than the sum of its proper divisors (7266465).

21799383 is an equidigital number, since it uses as much as digits as its factorization.

21799383 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7266464.

The product of its digits is 81648, while the sum is 42.

The square root of 21799383 is about 4668.9809380635. The cubic root of 21799383 is about 279.3496086208.

The spelling of 21799383 in words is "twenty-one million, seven hundred ninety-nine thousand, three hundred eighty-three".