21184049 has 2 divisors, whose sum is σ = 21184050. Its totient is φ = 21184048.

The previous prime is 21184027. The next prime is 21184073. The reversal of 21184049 is 94048112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19963024 + 1221025 = 4468^2 + 1105^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21184049 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21184099) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10592024 + 10592025.

It is an arithmetic number, because the mean of its divisors is an integer number (10592025).

Almost surely, 2^21184049 is an apocalyptic number.

It is an amenable number.

21184049 is a deficient number, since it is larger than the sum of its proper divisors (1).

21184049 is an equidigital number, since it uses as much as digits as its factorization.

21184049 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2304, while the sum is 29.

The square root of 21184049 is about 4602.6132794316. The cubic root of 21184049 is about 276.6960700028.

The spelling of 21184049 in words is "twenty-one million, one hundred eighty-four thousand, forty-nine".