340216321 has 2 divisors, whose sum is σ = 340216322. Its totient is φ = 340216320.

The previous prime is 340216307. The next prime is 340216333. The reversal of 340216321 is 123612043.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 258855921 + 81360400 = 16089^2 + 9020^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-340216321 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 340216292 and 340216301.

It is not a weakly prime, because it can be changed into another prime (340216421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 170108160 + 170108161.

It is an arithmetic number, because the mean of its divisors is an integer number (170108161).

Almost surely, 2^340216321 is an apocalyptic number.

It is an amenable number.

340216321 is a deficient number, since it is larger than the sum of its proper divisors (1).

340216321 is an equidigital number, since it uses as much as digits as its factorization.

340216321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 340216321 is about 18444.9538085624. The cubic root of 340216321 is about 698.1011948148.

Adding to 340216321 its reverse (123612043), we get a palindrome (463828364).

The spelling of 340216321 in words is "three hundred forty million, two hundred sixteen thousand, three hundred twenty-one".