21212210111110 has 16 divisors (see below), whose sum is σ = 38192362268976. Its totient is φ = 8482576473568.

The previous prime is 21212210111089. The next prime is 21212210111119. The reversal of 21212210111110 is 1111101221212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21212210111119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 288407752 + ... + 288481291.

It is an arithmetic number, because the mean of its divisors is an integer number (2387022641811).

Almost surely, 2^{21212210111110} is an apocalyptic number.

21212210111110 is a deficient number, since it is larger than the sum of its proper divisors (16980152157866).

21212210111110 is a wasteful number, since it uses less digits than its factorization.

21212210111110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 576892727.

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

Adding to 21212210111110 its reverse (1111101221212), we get a palindrome (22323311332322).

The spelling of 21212210111110 in words is "twenty-one trillion, two hundred twelve billion, two hundred ten million, one hundred eleven thousand, one hundred ten".