217422941 has 2 divisors, whose sum is σ = 217422942. Its totient is φ = 217422940.

The previous prime is 217422917. The next prime is 217422943. The reversal of 217422941 is 149224712.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 190164100 + 27258841 = 13790^2 + 5221^2 .

It is a cyclic number.

It is not a de Polignac number, because 217422941 - 2¹⁰ = 217421917 is a prime.

Together with 217422943, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 217422898 and 217422907.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (217422943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108711470 + 108711471.

It is an arithmetic number, because the mean of its divisors is an integer number (108711471).

Almost surely, 2^217422941 is an apocalyptic number.

It is an amenable number.

217422941 is a deficient number, since it is larger than the sum of its proper divisors (1).

217422941 is an equidigital number, since it uses as much as digits as its factorization.

217422941 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8064, while the sum is 32.

The square root of 217422941 is about 14745.2684275329. The cubic root of 217422941 is about 601.3146553281.

The spelling of 217422941 in words is "two hundred seventeen million, four hundred twenty-two thousand, nine hundred forty-one".