21212211110 has 8 divisors (see below), whose sum is σ = 38181980016. Its totient is φ = 8484884440.

The previous prime is 21212211103. The next prime is 21212211121. The reversal of 21212211110 is 1111221212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

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 3 ways as a sum of consecutive naturals, for example, 1060610546 + ... + 1060610565.

It is an arithmetic number, because the mean of its divisors is an integer number (4772747502).

Almost surely, 2^21212211110 is an apocalyptic number.

21212211110 is a deficient number, since it is larger than the sum of its proper divisors (16969768906).

21212211110 is a wasteful number, since it uses less digits than its factorization.

21212211110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2121221118.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21212211110 its reverse (1111221212), we get a palindrome (22323432322).

The spelling of 21212211110 in words is "twenty-one billion, two hundred twelve million, two hundred eleven thousand, one hundred ten".