340221023 has 2 divisors, whose sum is σ = 340221024. Its totient is φ = 340221022.

The previous prime is 340221019. The next prime is 340221043. The reversal of 340221023 is 320122043.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 340221023 - 2² = 340221019 is a prime.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 340220992 and 340221010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (340221043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 170110511 + 170110512.

It is an arithmetic number, because the mean of its divisors is an integer number (170110512).

Almost surely, 2^340221023 is an apocalyptic number.

340221023 is a deficient number, since it is larger than the sum of its proper divisors (1).

340221023 is an equidigital number, since it uses as much as digits as its factorization.

340221023 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 17.

The square root of 340221023 is about 18445.0812684575. The cubic root of 340221023 is about 698.1044108634.

Adding to 340221023 its reverse (320122043), we get a palindrome (660343066).

The spelling of 340221023 in words is "three hundred forty million, two hundred twenty-one thousand, twenty-three".