21323127 has 16 divisors (see below), whose sum is σ = 32906240. Its totient is φ = 12029472.

The previous prime is 21323089. The next prime is 21323129. The reversal of 21323127 is 72132312.

It is not a de Polignac number, because 21323127 - 2⁷ = 21322999 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21323129) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4768 + ... + 8085.

It is an arithmetic number, because the mean of its divisors is an integer number (2056640).

Almost surely, 2^21323127 is an apocalyptic number.

21323127 is a deficient number, since it is larger than the sum of its proper divisors (11583113).

21323127 is a wasteful number, since it uses less digits than its factorization.

21323127 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12942.

The product of its digits is 504, while the sum is 21.

The square root of 21323127 is about 4617.6971533439. The cubic root of 21323127 is about 277.3002734582.

Adding to 21323127 its reverse (72132312), we get a palindrome (93455439).

The spelling of 21323127 in words is "twenty-one million, three hundred twenty-three thousand, one hundred twenty-seven".