21212110222 has 16 divisors (see below), whose sum is σ = 32685055200. Its totient is φ = 10318533760.

The previous prime is 21212110187. The next prime is 21212110229. The reversal of 21212110222 is 22201121212.

It is a happy number.

It is a super-3 number, since 3×21212110222³ (a number of 32 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21212110196 and 21212110205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21212110229) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 330847 + ... + 389722.

It is an arithmetic number, because the mean of its divisors is an integer number (2042815950).

Almost surely, 2^21212110222 is an apocalyptic number.

21212110222 is a deficient number, since it is larger than the sum of its proper divisors (11472944978).

21212110222 is a wasteful number, since it uses less digits than its factorization.

21212110222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 720971.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21212110222 its reverse (22201121212), we get a palindrome (43413231434).

The spelling of 21212110222 in words is "twenty-one billion, two hundred twelve million, one hundred ten thousand, two hundred twenty-two".