23170021 has 8 divisors (see below), whose sum is σ = 26723840. Its totient is φ = 19677168.

The previous prime is 23170009. The next prime is 23170027. The reversal of 23170021 is 12007132.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 23170021 - 2¹³ = 23161829 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 23169977 and 23170004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23170027) 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, 14421 + ... + 15946.

It is an arithmetic number, because the mean of its divisors is an integer number (3340480).

Almost surely, 2^23170021 is an apocalyptic number.

It is an amenable number.

23170021 is a deficient number, since it is larger than the sum of its proper divisors (3553819).

23170021 is a wasteful number, since it uses less digits than its factorization.

23170021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30483.

The product of its (nonzero) digits is 84, while the sum is 16.

The square root of 23170021 is about 4813.5247999777. The cubic root of 23170021 is about 285.0857277758.

Adding to 23170021 its reverse (12007132), we get a palindrome (35177153).

The spelling of 23170021 in words is "twenty-three million, one hundred seventy thousand, twenty-one".