340111021 has 2 divisors, whose sum is σ = 340111022. Its totient is φ = 340111020.

The previous prime is 340111019. The next prime is 340111033. The reversal of 340111021 is 120111043.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 170824900 + 169286121 = 13070^2 + 13011^2 .

It is a cyclic number.

It is not a de Polignac number, because 340111021 - 2¹ = 340111019 is a prime.

Together with 340111019, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 340110992 and 340111010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (340111081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 170055510 + 170055511.

It is an arithmetic number, because the mean of its divisors is an integer number (170055511).

Almost surely, 2^340111021 is an apocalyptic number.

It is an amenable number.

340111021 is a deficient number, since it is larger than the sum of its proper divisors (1).

340111021 is an equidigital number, since it uses as much as digits as its factorization.

340111021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 340111021 is about 18442.0991484158. The cubic root of 340111021 is about 698.0291645244.

Adding to 340111021 its reverse (120111043), we get a palindrome (460222064).

The spelling of 340111021 in words is "three hundred forty million, one hundred eleven thousand, twenty-one".