21113344249 has 2 divisors, whose sum is σ = 21113344250. Its totient is φ = 21113344248.

The previous prime is 21113344181. The next prime is 21113344261. The reversal of 21113344249 is 94244331112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16761963024 + 4351381225 = 129468^2 + 65965^2 .

It is a cyclic number.

It is not a de Polignac number, because 21113344249 - 2¹⁵ = 21113311481 is a prime.

It is not a weakly prime, because it can be changed into another prime (21113345249) 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 as a sum of consecutive naturals, namely, 10556672124 + 10556672125.

It is an arithmetic number, because the mean of its divisors is an integer number (10556672125).

Almost surely, 2^21113344249 is an apocalyptic number.

It is an amenable number.

21113344249 is a deficient number, since it is larger than the sum of its proper divisors (1).

21113344249 is an equidigital number, since it uses as much as digits as its factorization.

21113344249 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20736, while the sum is 34.

The spelling of 21113344249 in words is "twenty-one billion, one hundred thirteen million, three hundred forty-four thousand, two hundred forty-nine".