21384136 has 16 divisors (see below), whose sum is σ = 41478300. Its totient is φ = 10323264.

The previous prime is 21384073. The next prime is 21384151. The reversal of 21384136 is 63148312.

It can be written as a sum of positive squares in 2 ways, for example, as 20196036 + 1188100 = 4494^2 + 1090^2 .

It is an unprimeable number.

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, 45855 + ... + 46318.

Almost surely, 2^21384136 is an apocalyptic number.

It is an amenable number.

21384136 is a deficient number, since it is larger than the sum of its proper divisors (20094164).

21384136 is a wasteful number, since it uses less digits than its factorization.

21384136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92208 (or 92204 counting only the distinct ones).

The product of its digits is 3456, while the sum is 28.

The square root of 21384136 is about 4624.2984332761. The cubic root of 21384136 is about 277.5644889755.

The spelling of 21384136 in words is "twenty-one million, three hundred eighty-four thousand, one hundred thirty-six".