21069074 has 8 divisors (see below), whose sum is σ = 34034700. Its totient is φ = 9724176.

The previous prime is 21069073. The next prime is 21069089. The reversal of 21069074 is 47096012.

It can be written as a sum of positive squares in 2 ways, for example, as 14784025 + 6285049 = 3845^2 + 2507^2 .

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

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21069073) 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 in 3 ways as a sum of consecutive naturals, for example, 405149 + ... + 405200.

Almost surely, 2^21069074 is an apocalyptic number.

21069074 is a deficient number, since it is larger than the sum of its proper divisors (12965626).

21069074 is a wasteful number, since it uses less digits than its factorization.

21069074 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 810364.

The product of its (nonzero) digits is 3024, while the sum is 29.

The square root of 21069074 is about 4590.1060989916. The cubic root of 21069074 is about 276.1945785369.

The spelling of 21069074 in words is "twenty-one million, sixty-nine thousand, seventy-four".