21058273 has 2 divisors, whose sum is σ = 21058274. Its totient is φ = 21058272.

The previous prime is 21058259. The next prime is 21058283. The reversal of 21058273 is 37285012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17918289 + 3139984 = 4233^2 + 1772^2 .

It is a cyclic number.

It is not a de Polignac number, because 21058273 - 2⁵ = 21058241 is a prime.

It is not a weakly prime, because it can be changed into another prime (21058243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10529136 + 10529137.

It is an arithmetic number, because the mean of its divisors is an integer number (10529137).

Almost surely, 2^21058273 is an apocalyptic number.

It is an amenable number.

21058273 is a deficient number, since it is larger than the sum of its proper divisors (1).

21058273 is an equidigital number, since it uses as much as digits as its factorization.

21058273 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3360, while the sum is 28.

The square root of 21058273 is about 4588.9293958395. The cubic root of 21058273 is about 276.1473736849.

The spelling of 21058273 in words is "twenty-one million, fifty-eight thousand, two hundred seventy-three".