21422411 has 2 divisors, whose sum is σ = 21422412. Its totient is φ = 21422410.

The previous prime is 21422399. The next prime is 21422413. The reversal of 21422411 is 11422412.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21422411 - 2⁶ = 21422347 is a prime.

Together with 21422413, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21422411.

It is not a weakly prime, because it can be changed into another prime (21422413) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10711205 + 10711206.

It is an arithmetic number, because the mean of its divisors is an integer number (10711206).

Almost surely, 2^21422411 is an apocalyptic number.

21422411 is a deficient number, since it is larger than the sum of its proper divisors (1).

21422411 is an equidigital number, since it uses as much as digits as its factorization.

21422411 is an evil number, because the sum of its binary digits is even.

The product of its digits is 128, while the sum is 17.

The square root of 21422411 is about 4628.4350486963. The cubic root of 21422411 is about 277.7299924853.

Adding to 21422411 its reverse (11422412), we get a palindrome (32844823).

Subtracting from 21422411 its reverse (11422412), we obtain a palindrome (9999999).

The spelling of 21422411 in words is "twenty-one million, four hundred twenty-two thousand, four hundred eleven".