21494183 has 2 divisors, whose sum is σ = 21494184. Its totient is φ = 21494182.

The previous prime is 21494173. The next prime is 21494219. The reversal of 21494183 is 38149412.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21494183 - 2¹⁰ = 21493159 is a prime.

It is a Sophie Germain prime.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21494173) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10747091 + 10747092.

It is an arithmetic number, because the mean of its divisors is an integer number (10747092).

Almost surely, 2^21494183 is an apocalyptic number.

21494183 is a deficient number, since it is larger than the sum of its proper divisors (1).

21494183 is an equidigital number, since it uses as much as digits as its factorization.

21494183 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6912, while the sum is 32.

The square root of 21494183 is about 4636.1819420726. The cubic root of 21494183 is about 278.0398084911.

The spelling of 21494183 in words is "twenty-one million, four hundred ninety-four thousand, one hundred eighty-three".