21212102222 has 32 divisors (see below), whose sum is σ = 34593122304. Its totient is φ = 9725839200.

The previous prime is 21212102201. The next prime is 21212102237. The reversal of 21212102222 is 22220121212.

It is a happy number.

It is a super-3 number, since 3×21212102222³ (a number of 32 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21212102222.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 83072 + ... + 222092.

It is an arithmetic number, because the mean of its divisors is an integer number (1081035072).

Almost surely, 2^21212102222 is an apocalyptic number.

21212102222 is a deficient number, since it is larger than the sum of its proper divisors (13381020082).

21212102222 is a wasteful number, since it uses less digits than its factorization.

21212102222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139184.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 21212102222 its reverse (22220121212), we get a palindrome (43432223434).

The spelling of 21212102222 in words is "twenty-one billion, two hundred twelve million, one hundred two thousand, two hundred twenty-two".