21101220110 has 32 divisors (see below), whose sum is σ = 38928615552. Its totient is φ = 8231453440.

The previous prime is 21101220109. The next prime is 21101220163. The reversal of 21101220110 is 1102210112.

It is a super-2 number, since 2×21101220110² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21101220091 and 21101220100.

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 15 ways as a sum of consecutive naturals, for example, 52184 + ... + 211956.

It is an arithmetic number, because the mean of its divisors is an integer number (1216519236).

Almost surely, 2^21101220110 is an apocalyptic number.

21101220110 is a deficient number, since it is larger than the sum of its proper divisors (17827395442).

21101220110 is a wasteful number, since it uses less digits than its factorization.

21101220110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160108.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 21101220110 its reverse (1102210112), we get a palindrome (22203430222).

The spelling of 21101220110 in words is "twenty-one billion, one hundred one million, two hundred twenty thousand, one hundred ten".