340202021 has 2 divisors, whose sum is σ = 340202022. Its totient is φ = 340202020.

The previous prime is 340202003. The next prime is 340202033. The reversal of 340202021 is 120202043.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 313679521 + 26522500 = 17711^2 + 5150^2 .

It is a cyclic number.

It is not a de Polignac number, because 340202021 - 2⁶ = 340201957 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 340201987 and 340202005.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (340204021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 170101010 + 170101011.

It is an arithmetic number, because the mean of its divisors is an integer number (170101011).

Almost surely, 2^340202021 is an apocalyptic number.

It is an amenable number.

340202021 is a deficient number, since it is larger than the sum of its proper divisors (1).

340202021 is an equidigital number, since it uses as much as digits as its factorization.

340202021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96, while the sum is 14.

The square root of 340202021 is about 18444.5661645917. The cubic root of 340202021 is about 698.0914137957.

Adding to 340202021 its reverse (120202043), we get a palindrome (460404064).

The spelling of 340202021 in words is "three hundred forty million, two hundred two thousand, twenty-one".