21212122211110 has 128 divisors (see below), whose sum is σ = 40314964377600. Its totient is φ = 8025570408960.

The previous prime is 21212122211083. The next prime is 21212122211113. The reversal of 21212122211110 is 1111222121212.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21212122211113) 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 63 ways as a sum of consecutive naturals, for example, 3649080564 + ... + 3649086376.

It is an arithmetic number, because the mean of its divisors is an integer number (314960659200).

Almost surely, 2^{21212122211110} is an apocalyptic number.

21212122211110 is a deficient number, since it is larger than the sum of its proper divisors (19102842166490).

21212122211110 is a wasteful number, since it uses less digits than its factorization.

21212122211110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7406.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 21212122211110 its reverse (1111222121212), we get a palindrome (22323344332322).

The spelling of 21212122211110 in words is "twenty-one trillion, two hundred twelve billion, one hundred twenty-two million, two hundred eleven thousand, one hundred ten".