23421217 has 2 divisors, whose sum is σ = 23421218. Its totient is φ = 23421216.

The previous prime is 23421173. The next prime is 23421221. The reversal of 23421217 is 71212432.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18181696 + 5239521 = 4264^2 + 2289^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23421217 is a prime.

It is a super-2 number, since 2×23421217² = 1097106811522178, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (23421287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11710608 + 11710609.

It is an arithmetic number, because the mean of its divisors is an integer number (11710609).

Almost surely, 2^23421217 is an apocalyptic number.

It is an amenable number.

23421217 is a deficient number, since it is larger than the sum of its proper divisors (1).

23421217 is an equidigital number, since it uses as much as digits as its factorization.

23421217 is an evil number, because the sum of its binary digits is even.

The product of its digits is 672, while the sum is 22.

The square root of 23421217 is about 4839.5471895623. The cubic root of 23421217 is about 286.1122719265.

Adding to 23421217 its reverse (71212432), we get a palindrome (94633649).

The spelling of 23421217 in words is "twenty-three million, four hundred twenty-one thousand, two hundred seventeen".