21112222213 has 2 divisors, whose sum is σ = 21112222214. Its totient is φ = 21112222212.

The previous prime is 21112222211. The next prime is 21112222217. The reversal of 21112222213 is 31222221112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21111218209 + 1004004 = 145297^2 + 1002^2 .

It is a cyclic number.

It is not a de Polignac number, because 21112222213 - 2¹ = 21112222211 is a prime.

Together with 21112222211, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21112222211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10556111106 + 10556111107.

It is an arithmetic number, because the mean of its divisors is an integer number (10556111107).

Almost surely, 2^21112222213 is an apocalyptic number.

It is an amenable number.

21112222213 is a deficient number, since it is larger than the sum of its proper divisors (1).

21112222213 is an equidigital number, since it uses as much as digits as its factorization.

21112222213 is an evil number, because the sum of its binary digits is even.

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

Adding to 21112222213 its reverse (31222221112), we get a palindrome (52334443325).

The spelling of 21112222213 in words is "twenty-one billion, one hundred twelve million, two hundred twenty-two thousand, two hundred thirteen".