21112121210110 has 64 divisors (see below), whose sum is σ = 43606903122432. Its totient is φ = 7209125248896.

The previous prime is 21112121210087. The next prime is 21112121210129. The reversal of 21112121210110 is 1101212121112.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 16479444 + ... + 17714296.

It is an arithmetic number, because the mean of its divisors is an integer number (681357861288).

Almost surely, 2^{21112121210110} is an apocalyptic number.

21112121210110 is an abundant number, since it is smaller than the sum of its proper divisors (22494781912322).

21112121210110 is a wasteful number, since it uses less digits than its factorization.

21112121210110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1235857.

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

Adding to 21112121210110 its reverse (1101212121112), we get a palindrome (22213333331222).

The spelling of 21112121210110 in words is "twenty-one trillion, one hundred twelve billion, one hundred twenty-one million, two hundred ten thousand, one hundred ten".