21416411 has 2 divisors, whose sum is σ = 21416412. Its totient is φ = 21416410.

The previous prime is 21416389. The next prime is 21416431. The reversal of 21416411 is 11461412.

It is an a-pointer prime, because the next prime (21416431) can be obtained adding 21416411 to its sum of digits (20).

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21416411 is a prime.

It is not a weakly prime, because it can be changed into another prime (21416431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10708205 + 10708206.

It is an arithmetic number, because the mean of its divisors is an integer number (10708206).

Almost surely, 2^21416411 is an apocalyptic number.

21416411 is a deficient number, since it is larger than the sum of its proper divisors (1).

21416411 is an equidigital number, since it uses as much as digits as its factorization.

21416411 is an evil number, because the sum of its binary digits is even.

The product of its digits is 192, while the sum is 20.

The square root of 21416411 is about 4627.7868360589. The cubic root of 21416411 is about 277.7040611440.

Adding to 21416411 its reverse (11461412), we get a palindrome (32877823).

The spelling of 21416411 in words is "twenty-one million, four hundred sixteen thousand, four hundred eleven".