21048407 has 2 divisors, whose sum is σ = 21048408. Its totient is φ = 21048406.

The previous prime is 21048373. The next prime is 21048413. The reversal of 21048407 is 70484012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21048407 - 2¹² = 21044311 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21048487) 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, 10524203 + 10524204.

It is an arithmetic number, because the mean of its divisors is an integer number (10524204).

Almost surely, 2^21048407 is an apocalyptic number.

21048407 is a deficient number, since it is larger than the sum of its proper divisors (1).

21048407 is an equidigital number, since it uses as much as digits as its factorization.

21048407 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1792, while the sum is 26.

The square root of 21048407 is about 4587.8542914962. The cubic root of 21048407 is about 276.1042410630.

The spelling of 21048407 in words is "twenty-one million, forty-eight thousand, four hundred seven".