21342327 has 16 divisors (see below), whose sum is σ = 30419712. Its totient is φ = 13262720.

The previous prime is 21342311. The next prime is 21342329. The reversal of 21342327 is 72324312.

It is not a de Polignac number, because 21342327 - 2⁴ = 21342311 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21342297 and 21342306.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21342329) 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, 3502 + ... + 7412.

It is an arithmetic number, because the mean of its divisors is an integer number (1901232).

Almost surely, 2^21342327 is an apocalyptic number.

21342327 is a deficient number, since it is larger than the sum of its proper divisors (9077385).

21342327 is a wasteful number, since it uses less digits than its factorization.

With its successor (21342328) it forms an eRAP, since the sums of their prime factors are consecutive (4038 and 4039).

21342327 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4038.

The product of its digits is 2016, while the sum is 24.

The square root of 21342327 is about 4619.7756439031. The cubic root of 21342327 is about 277.3834783908.

Adding to 21342327 its reverse (72324312), we get a palindrome (93666639).

The spelling of 21342327 in words is "twenty-one million, three hundred forty-two thousand, three hundred twenty-seven".