21436327 has 16 divisors (see below), whose sum is σ = 24167808. Its totient is φ = 18846880.

The previous prime is 21436319. The next prime is 21436333. The reversal of 21436327 is 72363412.

It is a cyclic number.

It is not a de Polignac number, because 21436327 - 2³ = 21436319 is a prime.

It is a super-2 number, since 2×21436327² = 919032230501858, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21436295 and 21436304.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21436367) 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, 48168 + ... + 48610.

It is an arithmetic number, because the mean of its divisors is an integer number (1510488).

Almost surely, 2^21436327 is an apocalyptic number.

21436327 is a deficient number, since it is larger than the sum of its proper divisors (2731481).

21436327 is a wasteful number, since it uses less digits than its factorization.

21436327 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 590.

The product of its digits is 6048, while the sum is 28.

The square root of 21436327 is about 4629.9381205368. The cubic root of 21436327 is about 277.7901172770.

Adding to 21436327 its reverse (72363412), we get a palindrome (93799739).

The spelling of 21436327 in words is "twenty-one million, four hundred thirty-six thousand, three hundred twenty-seven".