21134427 has 8 divisors (see below), whose sum is σ = 28218960. Its totient is φ = 14069760.

The previous prime is 21134419. The next prime is 21134431. The reversal of 21134427 is 72443112.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21134427 - 2³ = 21134419 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21134397 and 21134406.

It is not an unprimeable number, because it can be changed into a prime (21134497) 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 7 ways as a sum of consecutive naturals, for example, 2274 + ... + 6887.

It is an arithmetic number, because the mean of its divisors is an integer number (3527370).

Almost surely, 2^21134427 is an apocalyptic number.

21134427 is a deficient number, since it is larger than the sum of its proper divisors (7084533).

21134427 is an equidigital number, since it uses as much as digits as its factorization.

21134427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9933.

The product of its digits is 1344, while the sum is 24.

The square root of 21134427 is about 4597.2194857327. The cubic root of 21134427 is about 276.4798546952.

Adding to 21134427 its reverse (72443112), we get a palindrome (93577539).

The spelling of 21134427 in words is "twenty-one million, one hundred thirty-four thousand, four hundred twenty-seven".