21233017 has 16 divisors (see below), whose sum is σ = 25053840. Its totient is φ = 17805312.

The previous prime is 21233011. The next prime is 21233027. The reversal of 21233017 is 71033212.

It can be written as a sum of positive squares in 8 ways, for example, as 992016 + 20241001 = 996^2 + 4499^2 .

It is a cyclic number.

It is not a de Polignac number, because 21233017 - 2¹¹ = 21230969 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21232985 and 21233003.

It is not an unprimeable number, because it can be changed into a prime (21233011) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4753 + ... + 8065.

It is an arithmetic number, because the mean of its divisors is an integer number (1565865).

Almost surely, 2^21233017 is an apocalyptic number.

It is an amenable number.

21233017 is a deficient number, since it is larger than the sum of its proper divisors (3820823).

21233017 is a wasteful number, since it uses less digits than its factorization.

21233017 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3372.

The product of its (nonzero) digits is 252, while the sum is 19.

The square root of 21233017 is about 4607.9297954721. The cubic root of 21233017 is about 276.9091049238.

Adding to 21233017 its reverse (71033212), we get a palindrome (92266229).

The spelling of 21233017 in words is "twenty-one million, two hundred thirty-three thousand, seventeen".