21211002222 has 64 divisors (see below), whose sum is σ = 45240249600. Its totient is φ = 6610775040.

The previous prime is 21211002209. The next prime is 21211002227. The reversal of 21211002222 is 22220011212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21211002227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4299097 + ... + 4304027.

It is an arithmetic number, because the mean of its divisors is an integer number (706878900).

Almost surely, 2^21211002222 is an apocalyptic number.

21211002222 is an abundant number, since it is smaller than the sum of its proper divisors (24029247378).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21211002222 is a wasteful number, since it uses less digits than its factorization.

21211002222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5441.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 21211002222 its reverse (22220011212), we get a palindrome (43431013434).

The spelling of 21211002222 in words is "twenty-one billion, two hundred eleven million, two thousand, two hundred twenty-two".