346678021 has 2 divisors, whose sum is σ = 346678022. Its totient is φ = 346678020.

The previous prime is 346677983. The next prime is 346678027. The reversal of 346678021 is 120876643.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 183196225 + 163481796 = 13535^2 + 12786^2 .

It is a cyclic number.

It is not a de Polignac number, because 346678021 - 2²⁵ = 313123589 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (346678027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 173339010 + 173339011.

It is an arithmetic number, because the mean of its divisors is an integer number (173339011).

Almost surely, 2^346678021 is an apocalyptic number.

It is an amenable number.

346678021 is a deficient number, since it is larger than the sum of its proper divisors (1).

346678021 is an equidigital number, since it uses as much as digits as its factorization.

346678021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48384, while the sum is 37.

The square root of 346678021 is about 18619.2916352905. The cubic root of 346678021 is about 702.4931647448.

The spelling of 346678021 in words is "three hundred forty-six million, six hundred seventy-eight thousand, twenty-one".