21488683 has 2 divisors, whose sum is σ = 21488684. Its totient is φ = 21488682.

The previous prime is 21488671. The next prime is 21488689. The reversal of 21488683 is 38688412.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21488683 - 2⁵ = 21488651 is a prime.

It is a super-4 number, since 4×21488683⁴ (a number of 30 digits) contains 4444 as substring.

It is not a weakly prime, because it can be changed into another prime (21488689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10744341 + 10744342.

It is an arithmetic number, because the mean of its divisors is an integer number (10744342).

Almost surely, 2^21488683 is an apocalyptic number.

21488683 is a deficient number, since it is larger than the sum of its proper divisors (1).

21488683 is an equidigital number, since it uses as much as digits as its factorization.

21488683 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 73728, while the sum is 40.

The square root of 21488683 is about 4635.5887436225. The cubic root of 21488683 is about 278.0160912308.

The spelling of 21488683 in words is "twenty-one million, four hundred eighty-eight thousand, six hundred eighty-three".