21222112213 has 8 divisors (see below), whose sum is σ = 22684931136. Its totient is φ = 19804303200.

The previous prime is 21222112189. The next prime is 21222112229. The reversal of 21222112213 is 31221122212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21222112213 - 2¹⁷ = 21221981141 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21222112243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11251503 + ... + 11253388.

It is an arithmetic number, because the mean of its divisors is an integer number (2835616392).

Almost surely, 2^21222112213 is an apocalyptic number.

21222112213 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

21222112213 is a deficient number, since it is larger than the sum of its proper divisors (1462818923).

21222112213 is a wasteful number, since it uses less digits than its factorization.

21222112213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22504955.

The product of its digits is 192, while the sum is 19.

Adding to 21222112213 its reverse (31221122212), we get a palindrome (52443234425).

Subtracting 21222112213 from its reverse (31221122212), we obtain a palindrome (9999009999).

The spelling of 21222112213 in words is "twenty-one billion, two hundred twenty-two million, one hundred twelve thousand, two hundred thirteen".