21082577 has 2 divisors, whose sum is σ = 21082578. Its totient is φ = 21082576.

The previous prime is 21082543. The next prime is 21082591. The reversal of 21082577 is 77528012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14508481 + 6574096 = 3809^2 + 2564^2 .

It is a cyclic number.

It is not a de Polignac number, because 21082577 - 2²⁴ = 4305361 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21082517) 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, 10541288 + 10541289.

It is an arithmetic number, because the mean of its divisors is an integer number (10541289).

Almost surely, 2^21082577 is an apocalyptic number.

It is an amenable number.

21082577 is a deficient number, since it is larger than the sum of its proper divisors (1).

21082577 is an equidigital number, since it uses as much as digits as its factorization.

21082577 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7840, while the sum is 32.

The square root of 21082577 is about 4591.5767444310. The cubic root of 21082577 is about 276.2535695641.

The spelling of 21082577 in words is "twenty-one million, eighty-two thousand, five hundred seventy-seven".