21499039 has 2 divisors, whose sum is σ = 21499040. Its totient is φ = 21499038.

The previous prime is 21499021. The next prime is 21499057. The reversal of 21499039 is 93099412.

It is a balanced prime because it is at equal distance from previous prime (21499021) and next prime (21499057).

It is a cyclic number.

It is not a de Polignac number, because 21499039 - 2¹¹ = 21496991 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21498989 and 21499007.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21499939) 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, 10749519 + 10749520.

It is an arithmetic number, because the mean of its divisors is an integer number (10749520).

Almost surely, 2^21499039 is an apocalyptic number.

21499039 is a deficient number, since it is larger than the sum of its proper divisors (1).

21499039 is an equidigital number, since it uses as much as digits as its factorization.

21499039 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17496, while the sum is 37.

The square root of 21499039 is about 4636.7056192948. The cubic root of 21499039 is about 278.0607453131.

The spelling of 21499039 in words is "twenty-one million, four hundred ninety-nine thousand, thirty-nine".