21411427 has 8 divisors (see below), whose sum is σ = 22029840. Its totient is φ = 20801760.

The previous prime is 21411407. The next prime is 21411431. The reversal of 21411427 is 72411412.

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

It is a cyclic number.

It is not a de Polignac number, because 21411427 - 2¹¹ = 21409379 is a prime.

It is a Duffinian number.

It is a plaindrome in base 13.

It is a junction number, because it is equal to n+sod(n) for n = 21411398 and 21411407.

It is not an unprimeable number, because it can be changed into a prime (21411407) 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, 2949 + ... + 7177.

It is an arithmetic number, because the mean of its divisors is an integer number (2753730).

Almost surely, 2^21411427 is an apocalyptic number.

21411427 is a deficient number, since it is larger than the sum of its proper divisors (618413).

21411427 is an equidigital number, since it uses as much as digits as its factorization.

21411427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4373.

The product of its digits is 448, while the sum is 22.

The square root of 21411427 is about 4627.2483183853. The cubic root of 21411427 is about 277.6825171604.

Adding to 21411427 its reverse (72411412), we get a palindrome (93822839).

The spelling of 21411427 in words is "twenty-one million, four hundred eleven thousand, four hundred twenty-seven".