21800035 has 8 divisors (see below), whose sum is σ = 27698976. Its totient is φ = 16414080.

The previous prime is 21800017. The next prime is 21800039. The reversal of 21800035 is 53000812.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21800035 - 2⁵ = 21800003 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21799985 and 21800021.

It is not an unprimeable number, because it can be changed into a prime (21800039) 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 7 ways as a sum of consecutive naturals, for example, 128151 + ... + 128320.

It is an arithmetic number, because the mean of its divisors is an integer number (3462372).

Almost surely, 2^21800035 is an apocalyptic number.

21800035 is a deficient number, since it is larger than the sum of its proper divisors (5898941).

21800035 is a wasteful number, since it uses less digits than its factorization.

21800035 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 256493.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 21800035 is about 4669.0507600582. The cubic root of 21800035 is about 279.3523936251.

Adding to 21800035 its reverse (53000812), we get a palindrome (74800847).

The spelling of 21800035 in words is "twenty-one million, eight hundred thousand, thirty-five".