21200120110 has 16 divisors (see below), whose sum is σ = 41095617696. Its totient is φ = 7827736608.

The previous prime is 21200120087. The next prime is 21200120159. The reversal of 21200120110 is 1102100212.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 81538794 + ... + 81539053.

It is an arithmetic number, because the mean of its divisors is an integer number (2568476106).

Almost surely, 2^21200120110 is an apocalyptic number.

21200120110 is a deficient number, since it is larger than the sum of its proper divisors (19895497586).

21200120110 is a wasteful number, since it uses less digits than its factorization.

21200120110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163077867.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 21200120110 its reverse (1102100212), we get a palindrome (22302220322).

The spelling of 21200120110 in words is "twenty-one billion, two hundred million, one hundred twenty thousand, one hundred ten".