21102110110 has 32 divisors (see below), whose sum is σ = 38342139264. Its totient is φ = 8361444000.

The previous prime is 21102110039. The next prime is 21102110123. The reversal of 21102110110 is 1101120112.

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 polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 733905 + ... + 762115.

It is an arithmetic number, because the mean of its divisors is an integer number (1198191852).

Almost surely, 2^21102110110 is an apocalyptic number.

21102110110 is a deficient number, since it is larger than the sum of its proper divisors (17240029154).

21102110110 is a wasteful number, since it uses less digits than its factorization.

21102110110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28920.

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 21102110110 its reverse (1101120112), we get a palindrome (22203230222).

The spelling of 21102110110 in words is "twenty-one billion, one hundred two million, one hundred ten thousand, one hundred ten".