21494411 has 2 divisors, whose sum is σ = 21494412. Its totient is φ = 21494410.

The previous prime is 21494353. The next prime is 21494413. The reversal of 21494411 is 11449412.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21494411 - 2¹⁰ = 21493387 is a prime.

Together with 21494413, 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 (21494413) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10747205 + 10747206.

It is an arithmetic number, because the mean of its divisors is an integer number (10747206).

Almost surely, 2^21494411 is an apocalyptic number.

21494411 is a deficient number, since it is larger than the sum of its proper divisors (1).

21494411 is an equidigital number, since it uses as much as digits as its factorization.

21494411 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1152, while the sum is 26.

The square root of 21494411 is about 4636.2065312063. The cubic root of 21494411 is about 278.0407915920.

The spelling of 21494411 in words is "twenty-one million, four hundred ninety-four thousand, four hundred eleven".