21112220110 has 48 divisors (see below), whose sum is σ = 39560485536. Its totient is φ = 8111659136.

The previous prime is 21112220069. The next prime is 21112220113. The reversal of 21112220110 is 1102221112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21112220113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1650399 + ... + 1663141.

It is an arithmetic number, because the mean of its divisors is an integer number (824176782).

Almost surely, 2^21112220110 is an apocalyptic number.

21112220110 is a deficient number, since it is larger than the sum of its proper divisors (18448265426).

21112220110 is a wasteful number, since it uses less digits than its factorization.

21112220110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13005 (or 12976 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21112220110 its reverse (1102221112), we get a palindrome (22214441222).

The spelling of 21112220110 in words is "twenty-one billion, one hundred twelve million, two hundred twenty thousand, one hundred ten".