21800116 has 24 divisors (see below), whose sum is σ = 41588064. Its totient is φ = 9938400.

The previous prime is 21800101. The next prime is 21800131. The reversal of 21800116 is 61100812.

It is an interprime number because it is at equal distance from previous prime (21800101) and next prime (21800131).

It is a super-2 number, since 2×21800116² = 950490115226912, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21800093 and 21800102.

It is a congruent number.

It is an unprimeable number.

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, 1791 + ... + 6841.

It is an arithmetic number, because the mean of its divisors is an integer number (1732836).

Almost surely, 2^21800116 is an apocalyptic number.

21800116 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

21800116 is a deficient number, since it is larger than the sum of its proper divisors (19787948).

21800116 is a wasteful number, since it uses less digits than its factorization.

21800116 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5151 (or 5149 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 19.

The square root of 21800116 is about 4669.0594341901. The cubic root of 21800116 is about 279.3527396110.

Adding to 21800116 its reverse (61100812), we get a palindrome (82900928).

The spelling of 21800116 in words is "twenty-one million, eight hundred thousand, one hundred sixteen".