21074938 has 8 divisors (see below), whose sum is σ = 32702580. Its totient is φ = 10174080.

The previous prime is 21074929. The next prime is 21074939. The reversal of 21074938 is 83947012.

It can be written as a sum of positive squares in 2 ways, for example, as 20223009 + 851929 = 4497^2 + 923^2 .

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

It is not an unprimeable number, because it can be changed into a prime (21074939) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 181623 + ... + 181738.

Almost surely, 2^21074938 is an apocalyptic number.

21074938 is a deficient number, since it is larger than the sum of its proper divisors (11627642).

21074938 is a wasteful number, since it uses less digits than its factorization.

21074938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 363392.

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 21074938 is about 4590.7448197433. The cubic root of 21074938 is about 276.2201998935.

The spelling of 21074938 in words is "twenty-one million, seventy-four thousand, nine hundred thirty-eight".