344531021 has 2 divisors, whose sum is σ = 344531022. Its totient is φ = 344531020.

The previous prime is 344531017. The next prime is 344531029. The reversal of 344531021 is 120135443.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 216501796 + 128029225 = 14714^2 + 11315^2 .

It is a cyclic number.

It is not a de Polignac number, because 344531021 - 2² = 344531017 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (344531029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 172265510 + 172265511.

It is an arithmetic number, because the mean of its divisors is an integer number (172265511).

Almost surely, 2^344531021 is an apocalyptic number.

It is an amenable number.

344531021 is a deficient number, since it is larger than the sum of its proper divisors (1).

344531021 is an equidigital number, since it uses as much as digits as its factorization.

344531021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 344531021 is about 18561.5468374810. The cubic root of 344531021 is about 701.0399650801.

Adding to 344531021 its reverse (120135443), we get a palindrome (464666464).

The spelling of 344531021 in words is "three hundred forty-four million, five hundred thirty-one thousand, twenty-one".