345126321 has 6 divisors (see below), whose sum is σ = 498515810. Its totient is φ = 230084208.

The previous prime is 345126307. The next prime is 345126377. The reversal of 345126321 is 123621543.

It can be written as a sum of positive squares in only one way, i.e., 337640625 + 7485696 = 18375^2 + 2736^2 .

It is not a de Polignac number, because 345126321 - 2¹⁹ = 344602033 is a prime.

It is a super-2 number, since 2×345126321² = 238224354893990082, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (345126391) 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 in 5 ways as a sum of consecutive naturals, for example, 19173676 + ... + 19173693.

Almost surely, 2^345126321 is an apocalyptic number.

It is an amenable number.

345126321 is a deficient number, since it is larger than the sum of its proper divisors (153389489).

345126321 is a wasteful number, since it uses less digits than its factorization.

345126321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38347375 (or 38347372 counting only the distinct ones).

The product of its digits is 4320, while the sum is 27.

The square root of 345126321 is about 18577.5757568096. The cubic root of 345126321 is about 701.4434981291.

Adding to 345126321 its reverse (123621543), we get a palindrome (468747864).

The spelling of 345126321 in words is "three hundred forty-five million, one hundred twenty-six thousand, three hundred twenty-one".