21111112229 has 2 divisors, whose sum is σ = 21111112230. Its totient is φ = 21111112228.

The previous prime is 21111112207. The next prime is 21111112271. The reversal of 21111112229 is 92221111112.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17154450625 + 3956661604 = 130975^2 + 62902^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21111112229 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21111112289) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10555556114 + 10555556115.

It is an arithmetic number, because the mean of its divisors is an integer number (10555556115).

Almost surely, 2^21111112229 is an apocalyptic number.

It is an amenable number.

21111112229 is a deficient number, since it is larger than the sum of its proper divisors (1).

21111112229 is an equidigital number, since it uses as much as digits as its factorization.

21111112229 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 144, while the sum is 23.

The spelling of 21111112229 in words is "twenty-one billion, one hundred eleven million, one hundred twelve thousand, two hundred twenty-nine".