340221521 has 2 divisors, whose sum is σ = 340221522. Its totient is φ = 340221520.

The previous prime is 340221499. The next prime is 340221577. The reversal of 340221521 is 125122043.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 338560000 + 1661521 = 18400^2 + 1289^2 .

It is a cyclic number.

It is not a de Polignac number, because 340221521 - 2¹⁰ = 340220497 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 340221493 and 340221502.

It is not a weakly prime, because it can be changed into another prime (340220521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 170110760 + 170110761.

It is an arithmetic number, because the mean of its divisors is an integer number (170110761).

Almost surely, 2^340221521 is an apocalyptic number.

It is an amenable number.

340221521 is a deficient number, since it is larger than the sum of its proper divisors (1).

340221521 is an equidigital number, since it uses as much as digits as its factorization.

340221521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 340221521 is about 18445.0947679864. The cubic root of 340221521 is about 698.1047514810.

Adding to 340221521 its reverse (125122043), we get a palindrome (465343564).

The spelling of 340221521 in words is "three hundred forty million, two hundred twenty-one thousand, five hundred twenty-one".