21222722213 has 32 divisors (see below), whose sum is σ = 27197897472. Its totient is φ = 16081228800.

The previous prime is 21222722177. The next prime is 21222722237. The reversal of 21222722213 is 31222722212.

It is not a de Polignac number, because 21222722213 - 2¹⁰ = 21222721189 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 (21222722243) 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, 438143 + ... + 484163.

It is an arithmetic number, because the mean of its divisors is an integer number (849934296).

Almost surely, 2^21222722213 is an apocalyptic number.

It is an amenable number.

21222722213 is a deficient number, since it is larger than the sum of its proper divisors (5975175259).

21222722213 is a wasteful number, since it uses less digits than its factorization.

21222722213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46205.

The product of its digits is 2688, while the sum is 26.

Subtracting 21222722213 from its reverse (31222722212), we obtain a palindrome (9999999999).

The spelling of 21222722213 in words is "twenty-one billion, two hundred twenty-two million, seven hundred twenty-two thousand, two hundred thirteen".