21283927 has 4 divisors (see below), whose sum is σ = 24324496. Its totient is φ = 18243360.

The previous prime is 21283921. The next prime is 21283931. The reversal of 21283927 is 72938212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21283927 - 2³ = 21283919 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21283892 and 21283901.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21283921) 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 3 ways as a sum of consecutive naturals, for example, 1520274 + ... + 1520287.

It is an arithmetic number, because the mean of its divisors is an integer number (6081124).

Almost surely, 2^21283927 is an apocalyptic number.

21283927 is a deficient number, since it is larger than the sum of its proper divisors (3040569).

21283927 is an equidigital number, since it uses as much as digits as its factorization.

21283927 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3040568.

The product of its digits is 12096, while the sum is 34.

The square root of 21283927 is about 4613.4506608395. The cubic root of 21283927 is about 277.1302415065.

The spelling of 21283927 in words is "twenty-one million, two hundred eighty-three thousand, nine hundred twenty-seven".