21683084 has 24 divisors (see below), whose sum is σ = 38658816. Its totient is φ = 10640000.

The previous prime is 21683071. The next prime is 21683087. The reversal of 21683084 is 48038612.

It is a super-2 number, since 2×21683084² = 940312263502112, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21683084.

It is not an unprimeable number, because it can be changed into a prime (21683087) 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 7 ways as a sum of consecutive naturals, for example, 77024 + ... + 77304.

It is an arithmetic number, because the mean of its divisors is an integer number (1610784).

Almost surely, 2^21683084 is an apocalyptic number.

It is an amenable number.

21683084 is a deficient number, since it is larger than the sum of its proper divisors (16975732).

21683084 is a wasteful number, since it uses less digits than its factorization.

21683084 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 577 (or 575 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 32.

The square root of 21683084 is about 4656.5098518096. The cubic root of 21683084 is about 278.8519488741.

The spelling of 21683084 in words is "twenty-one million, six hundred eighty-three thousand, eighty-four".