21212030222 has 16 divisors (see below), whose sum is σ = 33406497360. Its totient is φ = 10087448448.

The previous prime is 21212030137. The next prime is 21212030233. The reversal of 21212030222 is 22203021212.

It is a super-2 number, since 2×21212030222² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21212030222.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 2725403 + ... + 2733174.

It is an arithmetic number, because the mean of its divisors is an integer number (2087906085).

Almost surely, 2^21212030222 is an apocalyptic number.

21212030222 is a deficient number, since it is larger than the sum of its proper divisors (12194467138).

21212030222 is a wasteful number, since it uses less digits than its factorization.

21212030222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5458675.

The product of its (nonzero) digits is 192, while the sum is 17.

Adding to 21212030222 its reverse (22203021212), we get a palindrome (43415051434).

The spelling of 21212030222 in words is "twenty-one billion, two hundred twelve million, thirty thousand, two hundred twenty-two".