21220100110 has 64 divisors (see below), whose sum is σ = 43139174400. Its totient is φ = 7444483200.

The previous prime is 21220100051. The next prime is 21220100123. The reversal of 21220100110 is 1100102212.

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 (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7140925 + ... + 7143895.

It is an arithmetic number, because the mean of its divisors is an integer number (674049600).

Almost surely, 2^21220100110 is an apocalyptic number.

21220100110 is an abundant number, since it is smaller than the sum of its proper divisors (21919074290).

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

21220100110 is a wasteful number, since it uses less digits than its factorization.

21220100110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5257.

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

Adding to 21220100110 its reverse (1100102212), we get a palindrome (22320202322).

The spelling of 21220100110 in words is "twenty-one billion, two hundred twenty million, one hundred thousand, one hundred ten".