21212000222 has 32 divisors (see below), whose sum is σ = 36477665280. Its totient is φ = 9062349120.

The previous prime is 21212000203. The next prime is 21212000261. The reversal of 21212000222 is 22200021212.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a junction number, because it is equal to n+sod(n) for n = 21212000197 and 21212000206.

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, 7892963 + ... + 7895649.

It is an arithmetic number, because the mean of its divisors is an integer number (1139927040).

Almost surely, 2^21212000222 is an apocalyptic number.

21212000222 is a deficient number, since it is larger than the sum of its proper divisors (15265665058).

21212000222 is a wasteful number, since it uses less digits than its factorization.

21212000222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4256.

The product of its (nonzero) digits is 64, while the sum is 14.

Adding to 21212000222 its reverse (22200021212), we get a palindrome (43412021434).

The spelling of 21212000222 in words is "twenty-one billion, two hundred twelve million, two hundred twenty-two", and thus it is an aban number.