21048019 has 2 divisors, whose sum is σ = 21048020. Its totient is φ = 21048018.

The previous prime is 21048007. The next prime is 21048061. The reversal of 21048019 is 91084012.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21048019 - 2⁵ = 21047987 is a prime.

It is a super-2 number, since 2×21048019² = 886038207648722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21047984 and 21048002.

It is not a weakly prime, because it can be changed into another prime (21048119) 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, 10524009 + 10524010.

It is an arithmetic number, because the mean of its divisors is an integer number (10524010).

Almost surely, 2^21048019 is an apocalyptic number.

21048019 is a deficient number, since it is larger than the sum of its proper divisors (1).

21048019 is an equidigital number, since it uses as much as digits as its factorization.

21048019 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 25.

The square root of 21048019 is about 4587.8120057387. The cubic root of 21048019 is about 276.1025445118.

The spelling of 21048019 in words is "twenty-one million, forty-eight thousand, nineteen".