21184150849 has 2 divisors, whose sum is σ = 21184150850. Its totient is φ = 21184150848.

The previous prime is 21184150837. The next prime is 21184150877. The reversal of 21184150849 is 94805148112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18643990849 + 2540160000 = 136543^2 + 50400^2 .

It is a cyclic number.

It is not a de Polignac number, because 21184150849 - 2¹⁹ = 21183626561 is a prime.

It is not a weakly prime, because it can be changed into another prime (21184156849) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10592075424 + 10592075425.

It is an arithmetic number, because the mean of its divisors is an integer number (10592075425).

Almost surely, 2^21184150849 is an apocalyptic number.

It is an amenable number.

21184150849 is a deficient number, since it is larger than the sum of its proper divisors (1).

21184150849 is an equidigital number, since it uses as much as digits as its factorization.

21184150849 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 92160, while the sum is 43.

The spelling of 21184150849 in words is "twenty-one billion, one hundred eighty-four million, one hundred fifty thousand, eight hundred forty-nine".