21058337 has 2 divisors, whose sum is σ = 21058338. Its totient is φ = 21058336.

The previous prime is 21058283. The next prime is 21058343. The reversal of 21058337 is 73385012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18627856 + 2430481 = 4316^2 + 1559^2 .

It is a cyclic number.

It is not a de Polignac number, because 21058337 - 2⁶ = 21058273 is a prime.

It is not a weakly prime, because it can be changed into another prime (21058537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10529168 + 10529169.

It is an arithmetic number, because the mean of its divisors is an integer number (10529169).

Almost surely, 2^21058337 is an apocalyptic number.

It is an amenable number.

21058337 is a deficient number, since it is larger than the sum of its proper divisors (1).

21058337 is an equidigital number, since it uses as much as digits as its factorization.

21058337 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 21058337 is about 4588.9363691383. The cubic root of 21058337 is about 276.1476534390.

The spelling of 21058337 in words is "twenty-one million, fifty-eight thousand, three hundred thirty-seven".