340500421 has 2 divisors, whose sum is σ = 340500422. Its totient is φ = 340500420.

The previous prime is 340500401. The next prime is 340500431. The reversal of 340500421 is 124005043.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 265331521 + 75168900 = 16289^2 + 8670^2 .

It is an emirp because it is prime and its reverse (124005043) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 340500421 - 2¹⁷ = 340369349 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (340500401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 170250210 + 170250211.

It is an arithmetic number, because the mean of its divisors is an integer number (170250211).

Almost surely, 2^340500421 is an apocalyptic number.

It is an amenable number.

340500421 is a deficient number, since it is larger than the sum of its proper divisors (1).

340500421 is an equidigital number, since it uses as much as digits as its factorization.

340500421 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 19.

The square root of 340500421 is about 18452.6534948229. The cubic root of 340500421 is about 698.2954588335.

Adding to 340500421 its reverse (124005043), we get a palindrome (464505464).

The spelling of 340500421 in words is "three hundred forty million, five hundred thousand, four hundred twenty-one".