21055110110 has 128 divisors (see below), whose sum is σ = 43188526080. Its totient is φ = 7350165504.

The previous prime is 21055110101. The next prime is 21055110121. The reversal of 21055110110 is 1101155012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 17300222 + ... + 17301438.

It is an arithmetic number, because the mean of its divisors is an integer number (337410360).

Almost surely, 2^21055110110 is an apocalyptic number.

21055110110 is an abundant number, since it is smaller than the sum of its proper divisors (22133415970).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21055110110 is a wasteful number, since it uses less digits than its factorization.

21055110110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1410.

The product of its (nonzero) digits is 50, while the sum is 17.

Adding to 21055110110 its reverse (1101155012), we get a palindrome (22156265122).

The spelling of 21055110110 in words is "twenty-one billion, fifty-five million, one hundred ten thousand, one hundred ten".