21083727 has 16 divisors (see below), whose sum is σ = 32195072. Its totient is φ = 12022560.

The previous prime is 21083719. The next prime is 21083773. The reversal of 21083727 is 72738012.

It is not a de Polignac number, because 21083727 - 2³ = 21083719 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21083694 and 21083703.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21081727) 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 15 ways as a sum of consecutive naturals, for example, 14577 + ... + 15957.

It is an arithmetic number, because the mean of its divisors is an integer number (2012192).

Almost surely, 2^21083727 is an apocalyptic number.

21083727 is a deficient number, since it is larger than the sum of its proper divisors (11111345).

21083727 is a wasteful number, since it uses less digits than its factorization.

21083727 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2118.

The product of its (nonzero) digits is 4704, while the sum is 30.

The square root of 21083727 is about 4591.7019720361. The cubic root of 21083727 is about 276.2585924451.

The spelling of 21083727 in words is "twenty-one million, eighty-three thousand, seven hundred twenty-seven".