21232017 has 8 divisors (see below), whose sum is σ = 31454880. Its totient is φ = 14154660.

The previous prime is 21232007. The next prime is 21232033. The reversal of 21232017 is 71023212.

It is not a de Polignac number, because 21232017 - 2⁸ = 21231761 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21232007) 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 in 7 ways as a sum of consecutive naturals, for example, 393159 + ... + 393212.

It is an arithmetic number, because the mean of its divisors is an integer number (3931860).

Almost surely, 2^21232017 is an apocalyptic number.

21232017 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

21232017 is a deficient number, since it is larger than the sum of its proper divisors (10222863).

21232017 is an equidigital number, since it uses as much as digits as its factorization.

21232017 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 786380 (or 786374 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 18.

The square root of 21232017 is about 4607.8212855969. The cubic root of 21232017 is about 276.9047577091.

Adding to 21232017 its reverse (71023212), we get a palindrome (92255229).

The spelling of 21232017 in words is "twenty-one million, two hundred thirty-two thousand, seventeen".