21036149 has 2 divisors, whose sum is σ = 21036150. Its totient is φ = 21036148.

The previous prime is 21036143. The next prime is 21036151. The reversal of 21036149 is 94163012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21022225 + 13924 = 4585^2 + 118^2 .

It is a cyclic number.

It is not a de Polignac number, because 21036149 - 2⁴ = 21036133 is a prime.

Together with 21036151, it forms a pair of twin primes.

It is a Chen prime.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21036143) 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, 10518074 + 10518075.

It is an arithmetic number, because the mean of its divisors is an integer number (10518075).

Almost surely, 2^21036149 is an apocalyptic number.

It is an amenable number.

21036149 is a deficient number, since it is larger than the sum of its proper divisors (1).

21036149 is an equidigital number, since it uses as much as digits as its factorization.

21036149 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 21036149 is about 4586.5181783135. The cubic root of 21036149 is about 276.0506322078.

The spelling of 21036149 in words is "twenty-one million, thirty-six thousand, one hundred forty-nine".