21200110 has 16 divisors (see below), whose sum is σ = 38462976. Its totient is φ = 8412768.

The previous prime is 21200093. The next prime is 21200117. The reversal of 21200110 is 1100212.

It is a junction number, because it is equal to n+sod(n) for n = 21200093 and 21200102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21200117) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7077 + ... + 9616.

It is an arithmetic number, because the mean of its divisors is an integer number (2403936).

Almost surely, 2^21200110 is an apocalyptic number.

21200110 is a deficient number, since it is larger than the sum of its proper divisors (17262866).

21200110 is a wasteful number, since it uses less digits than its factorization.

21200110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16827.

The product of its (nonzero) digits is 4, while the sum is 7.

The square root of 21200110 is about 4604.3577185097. The cubic root of 21200110 is about 276.7659794105.

Adding to 21200110 its reverse (1100212), we get a palindrome (22300322).

The spelling of 21200110 in words is "twenty-one million, two hundred thousand, one hundred ten".