21326411 has 2 divisors, whose sum is σ = 21326412. Its totient is φ = 21326410.

The previous prime is 21326387. The next prime is 21326413. The reversal of 21326411 is 11462312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21326411 - 2¹⁰ = 21325387 is a prime.

It is a super-2 number, since 2×21326411² = 909631612281842, which contains 22 as substring.

Together with 21326413, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21326413) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10663205 + 10663206.

It is an arithmetic number, because the mean of its divisors is an integer number (10663206).

Almost surely, 2^21326411 is an apocalyptic number.

21326411 is a deficient number, since it is larger than the sum of its proper divisors (1).

21326411 is an equidigital number, since it uses as much as digits as its factorization.

21326411 is an evil number, because the sum of its binary digits is even.

The product of its digits is 288, while the sum is 20.

The square root of 21326411 is about 4618.0527281529. The cubic root of 21326411 is about 277.3145085084.

Adding to 21326411 its reverse (11462312), we get a palindrome (32788723).

The spelling of 21326411 in words is "twenty-one million, three hundred twenty-six thousand, four hundred eleven".