21048361 has 2 divisors, whose sum is σ = 21048362. Its totient is φ = 21048360.

The previous prime is 21048341. The next prime is 21048373. The reversal of 21048361 is 16384012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20529961 + 518400 = 4531^2 + 720^2 .

It is a cyclic number.

It is not a de Polignac number, because 21048361 - 2¹⁷ = 20917289 is a prime.

It is not a weakly prime, because it can be changed into another prime (21048341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10524180 + 10524181.

It is an arithmetic number, because the mean of its divisors is an integer number (10524181).

Almost surely, 2^21048361 is an apocalyptic number.

It is an amenable number.

21048361 is a deficient number, since it is larger than the sum of its proper divisors (1).

21048361 is an equidigital number, since it uses as much as digits as its factorization.

21048361 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 21048361 is about 4587.8492782566. The cubic root of 21048361 is about 276.1040399266.

The spelling of 21048361 in words is "twenty-one million, forty-eight thousand, three hundred sixty-one".