21114649 has 2 divisors, whose sum is σ = 21114650. Its totient is φ = 21114648.

The previous prime is 21114647. The next prime is 21114659. The reversal of 21114649 is 94641112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14899600 + 6215049 = 3860^2 + 2493^2 .

It is a cyclic number.

It is not a de Polignac number, because 21114649 - 2¹ = 21114647 is a prime.

Together with 21114647, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (21114647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10557324 + 10557325.

It is an arithmetic number, because the mean of its divisors is an integer number (10557325).

Almost surely, 2^21114649 is an apocalyptic number.

It is an amenable number.

21114649 is a deficient number, since it is larger than the sum of its proper divisors (1).

21114649 is an equidigital number, since it uses as much as digits as its factorization.

21114649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1728, while the sum is 28.

The square root of 21114649 is about 4595.0678993895. The cubic root of 21114649 is about 276.3935827370.

The spelling of 21114649 in words is "twenty-one million, one hundred fourteen thousand, six hundred forty-nine".