21106382 has 16 divisors (see below), whose sum is σ = 34681392. Its totient is φ = 9553920.

The previous prime is 21106373. The next prime is 21106399. The reversal of 21106382 is 28360112.

It is a super-2 number, since 2×21106382² = 890958722259848, which contains 22 as substring.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 3788 + ... + 7520.

It is an arithmetic number, because the mean of its divisors is an integer number (2167587).

Almost surely, 2^21106382 is an apocalyptic number.

21106382 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21106382 is a deficient number, since it is larger than the sum of its proper divisors (13575010).

21106382 is a wasteful number, since it uses less digits than its factorization.

21106382 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4003.

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 21106382 is about 4594.1682598703. The cubic root of 21106382 is about 276.3575059826.

Adding to 21106382 its reverse (28360112), we get a palindrome (49466494).

The spelling of 21106382 in words is "twenty-one million, one hundred six thousand, three hundred eighty-two".