21027049 has 2 divisors, whose sum is σ = 21027050. Its totient is φ = 21027048.

The previous prime is 21027031. The next prime is 21027067. The reversal of 21027049 is 94072012.

It is a balanced prime because it is at equal distance from previous prime (21027031) and next prime (21027067).

It can be written as a sum of positive squares in only one way, i.e., 16646400 + 4380649 = 4080^2 + 2093^2 .

It is a cyclic number.

It is not a de Polignac number, because 21027049 - 2¹³ = 21018857 is a prime.

It is not a weakly prime, because it can be changed into another prime (21027449) 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, 10513524 + 10513525.

It is an arithmetic number, because the mean of its divisors is an integer number (10513525).

Almost surely, 2^21027049 is an apocalyptic number.

It is an amenable number.

21027049 is a deficient number, since it is larger than the sum of its proper divisors (1).

21027049 is an equidigital number, since it uses as much as digits as its factorization.

21027049 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 21027049 is about 4585.5260330741. The cubic root of 21027049 is about 276.0108210068.

The spelling of 21027049 in words is "twenty-one million, twenty-seven thousand, forty-nine".