21800353 has 4 divisors (see below), whose sum is σ = 22947760. Its totient is φ = 20652948.

The previous prime is 21800351. The next prime is 21800357. The reversal of 21800353 is 35300812.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21800353 - 2¹ = 21800351 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21800351) 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 in 3 ways as a sum of consecutive naturals, for example, 573675 + ... + 573712.

It is an arithmetic number, because the mean of its divisors is an integer number (5736940).

Almost surely, 2^21800353 is an apocalyptic number.

It is an amenable number.

21800353 is a deficient number, since it is larger than the sum of its proper divisors (1147407).

21800353 is a wasteful number, since it uses less digits than its factorization.

21800353 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1147406.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 21800353 is about 4669.0848139652. The cubic root of 21800353 is about 279.3537519353.

The spelling of 21800353 in words is "twenty-one million, eight hundred thousand, three hundred fifty-three".