21382104 has 32 divisors (see below), whose sum is σ = 53990640. Its totient is φ = 7056000.

The previous prime is 21382103. The next prime is 21382121. The reversal of 21382104 is 40128312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21382103) 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 7 ways as a sum of consecutive naturals, for example, 1987 + ... + 6834.

Almost surely, 2^21382104 is an apocalyptic number.

21382104 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21382104 is an abundant number, since it is smaller than the sum of its proper divisors (32608536).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21382104 is a wasteful number, since it uses less digits than its factorization.

21382104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8931 (or 8927 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 21382104 is about 4624.0787190531. The cubic root of 21382104 is about 277.5556969609. Note that the first 3 decimals are identical.

The spelling of 21382104 in words is "twenty-one million, three hundred eighty-two thousand, one hundred four".