21112202222 has 16 divisors (see below), whose sum is σ = 33339600000. Its totient is φ = 9999153720.

The previous prime is 21112202213. The next prime is 21112202227. The reversal of 21112202222 is 22220221112.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 21112202222.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21112202227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 279029 + ... + 346527.

It is an arithmetic number, because the mean of its divisors is an integer number (2083725000).

Almost surely, 2^21112202222 is an apocalyptic number.

21112202222 is a deficient number, since it is larger than the sum of its proper divisors (12227397778).

21112202222 is a wasteful number, since it uses less digits than its factorization.

21112202222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75751.

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

Adding to 21112202222 its reverse (22220221112), we get a palindrome (43332423334).

The spelling of 21112202222 in words is "twenty-one billion, one hundred twelve million, two hundred two thousand, two hundred twenty-two".