21212100110 has 8 divisors (see below), whose sum is σ = 38181780216. Its totient is φ = 8484840040.

The previous prime is 21212100097. The next prime is 21212100121. The reversal of 21212100110 is 1100121212.

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

It is a super-3 number, since 3×21212100110³ (a number of 32 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21212100091 and 21212100100.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1060604996 + ... + 1060605015.

It is an arithmetic number, because the mean of its divisors is an integer number (4772722527).

Almost surely, 2^21212100110 is an apocalyptic number.

21212100110 is a deficient number, since it is larger than the sum of its proper divisors (16969680106).

21212100110 is a wasteful number, since it uses less digits than its factorization.

21212100110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2121210018.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 21212100110 its reverse (1100121212), we get a palindrome (22312221322).

The spelling of 21212100110 in words is "twenty-one billion, two hundred twelve million, one hundred thousand, one hundred ten".