345042021 has 16 divisors (see below), whose sum is σ = 480489984. Its totient is φ = 219829104.

The previous prime is 345042017. The next prime is 345042077. The reversal of 345042021 is 120240543.

It is not a de Polignac number, because 345042021 - 2² = 345042017 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (345042001) 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 15 ways as a sum of consecutive naturals, for example, 138630 + ... + 141096.

It is an arithmetic number, because the mean of its divisors is an integer number (30030624).

Almost surely, 2^345042021 is an apocalyptic number.

It is an amenable number.

345042021 is a deficient number, since it is larger than the sum of its proper divisors (135447963).

345042021 is a wasteful number, since it uses less digits than its factorization.

345042021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4520.

The product of its (nonzero) digits is 960, while the sum is 21.

The square root of 345042021 is about 18575.3067538601. The cubic root of 345042021 is about 701.3863823250.

Adding to 345042021 its reverse (120240543), we get a palindrome (465282564).

The spelling of 345042021 in words is "three hundred forty-five million, forty-two thousand, twenty-one".