21495005 has 8 divisors (see below), whose sum is σ = 29478912. Its totient is φ = 14739408.

The previous prime is 21494999. The next prime is 21495011. The reversal of 21495005 is 50059412.

It is an interprime number because it is at equal distance from previous prime (21494999) and next prime (21495011).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21495005 - 2²⁰ = 20446429 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 307037 + ... + 307106.

It is an arithmetic number, because the mean of its divisors is an integer number (3684864).

Almost surely, 2^21495005 is an apocalyptic number.

It is an amenable number.

21495005 is a deficient number, since it is larger than the sum of its proper divisors (7983907).

21495005 is an equidigital number, since it uses as much as digits as its factorization.

21495005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 614155.

The product of its (nonzero) digits is 1800, while the sum is 26.

The square root of 21495005 is about 4636.2705917580. The cubic root of 21495005 is about 278.0433527959.

The spelling of 21495005 in words is "twenty-one million, four hundred ninety-five thousand, five".