21334427 has 2 divisors, whose sum is σ = 21334428. Its totient is φ = 21334426.

The previous prime is 21334387. The next prime is 21334433. The reversal of 21334427 is 72443312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21334427 - 2⁸ = 21334171 is a prime.

It is a Chen prime.

It is a plaindrome in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 21334396 and 21334405.

It is not a weakly prime, because it can be changed into another prime (21334447) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10667213 + 10667214.

It is an arithmetic number, because the mean of its divisors is an integer number (10667214).

Almost surely, 2^21334427 is an apocalyptic number.

21334427 is a deficient number, since it is larger than the sum of its proper divisors (1).

21334427 is an equidigital number, since it uses as much as digits as its factorization.

21334427 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4032, while the sum is 26.

The square root of 21334427 is about 4618.9205448892. The cubic root of 21334427 is about 277.3492490725.

Adding to 21334427 its reverse (72443312), we get a palindrome (93777739).

The spelling of 21334427 in words is "twenty-one million, three hundred thirty-four thousand, four hundred twenty-seven".