343477021 has 2 divisors, whose sum is σ = 343477022. Its totient is φ = 343477020.

The previous prime is 343477007. The next prime is 343477033. The reversal of 343477021 is 120774343.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 293265625 + 50211396 = 17125^2 + 7086^2 .

It is a cyclic number.

It is not a de Polignac number, because 343477021 - 2⁵ = 343476989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (343477091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 171738510 + 171738511.

It is an arithmetic number, because the mean of its divisors is an integer number (171738511).

Almost surely, 2^343477021 is an apocalyptic number.

It is an amenable number.

343477021 is a deficient number, since it is larger than the sum of its proper divisors (1).

343477021 is an equidigital number, since it uses as much as digits as its factorization.

343477021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14112, while the sum is 31.

The square root of 343477021 is about 18533.1330594695. The cubic root of 343477021 is about 700.3243537650.

The spelling of 343477021 in words is "three hundred forty-three million, four hundred seventy-seven thousand, twenty-one".