21082301 has 2 divisors, whose sum is σ = 21082302. Its totient is φ = 21082300.

The previous prime is 21082291. The next prime is 21082309. The reversal of 21082301 is 10328012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17935225 + 3147076 = 4235^2 + 1774^2 .

It is a cyclic number.

It is not a de Polignac number, because 21082301 - 2¹⁸ = 20820157 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21082301.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21082309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10541150 + 10541151.

It is an arithmetic number, because the mean of its divisors is an integer number (10541151).

Almost surely, 2^21082301 is an apocalyptic number.

It is an amenable number.

21082301 is a deficient number, since it is larger than the sum of its proper divisors (1).

21082301 is an equidigital number, since it uses as much as digits as its factorization.

21082301 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96, while the sum is 17.

The square root of 21082301 is about 4591.5466892976. The cubic root of 21082301 is about 276.2523640455.

The spelling of 21082301 in words is "twenty-one million, eighty-two thousand, three hundred one".