21182364 has 48 divisors (see below), whose sum is σ = 62764800. Its totient is φ = 6051888.

The previous prime is 21182327. The next prime is 21182377. The reversal of 21182364 is 46328112.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 13254 + ... + 14765.

It is an arithmetic number, because the mean of its divisors is an integer number (1307600).

Almost surely, 2^21182364 is an apocalyptic number.

It is an amenable number.

21182364 is an abundant number, since it is smaller than the sum of its proper divisors (41582436).

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

21182364 is a wasteful number, since it uses less digits than its factorization.

21182364 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28039 (or 28031 counting only the distinct ones).

The product of its digits is 2304, while the sum is 27.

The square root of 21182364 is about 4602.4302276080. The cubic root of 21182364 is about 276.6887335829.

The spelling of 21182364 in words is "twenty-one million, one hundred eighty-two thousand, three hundred sixty-four".