21212332222 has 32 divisors (see below), whose sum is σ = 35053574400. Its totient is φ = 9582427008.

The previous prime is 21212332217. The next prime is 21212332223. The reversal of 21212332222 is 22223321212.

It is a junction number, because it is equal to n+sod(n) for n = 21212332193 and 21212332202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21212332223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 258529 + ... + 330547.

It is an arithmetic number, because the mean of its divisors is an integer number (1095424200).

Almost surely, 2^21212332222 is an apocalyptic number.

21212332222 is a deficient number, since it is larger than the sum of its proper divisors (13841242178).

21212332222 is a wasteful number, since it uses less digits than its factorization.

21212332222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72400.

The product of its digits is 1152, while the sum is 22.

Adding to 21212332222 its reverse (22223321212), we get a palindrome (43435653434).

The spelling of 21212332222 in words is "twenty-one billion, two hundred twelve million, three hundred thirty-two thousand, two hundred twenty-two".