21074005 has 8 divisors (see below), whose sum is σ = 25635672. Its totient is φ = 16627968.

The previous prime is 21073991. The next prime is 21074023. The reversal of 21074005 is 50047012.

It can be written as a sum of positive squares in 4 ways, for example, as 362404 + 20711601 = 602^2 + 4551^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21074005 is a prime.

It is a super-2 number, since 2×21074005² = 888227373480050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28504 + ... + 29233.

It is an arithmetic number, because the mean of its divisors is an integer number (3204459).

Almost surely, 2^21074005 is an apocalyptic number.

It is an amenable number.

21074005 is a deficient number, since it is larger than the sum of its proper divisors (4561667).

21074005 is an equidigital number, since it uses as much as digits as its factorization.

21074005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57815.

The product of its (nonzero) digits is 280, while the sum is 19.

The square root of 21074005 is about 4590.6432011212. The cubic root of 21074005 is about 276.2161236894.

The spelling of 21074005 in words is "twenty-one million, seventy-four thousand, five".