345445021 has 4 divisors (see below), whose sum is σ = 346052700. Its totient is φ = 344837344.

The previous prime is 345445019. The next prime is 345445039. The reversal of 345445021 is 120544543.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 57972996 + 287472025 = 7614^2 + 16955^2 .

It is a cyclic number.

It is not a de Polignac number, because 345445021 - 2¹ = 345445019 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (345445091) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 302986 + ... + 304123.

It is an arithmetic number, because the mean of its divisors is an integer number (86513175).

Almost surely, 2^345445021 is an apocalyptic number.

It is an amenable number.

345445021 is a deficient number, since it is larger than the sum of its proper divisors (607679).

345445021 is an equidigital number, since it uses as much as digits as its factorization.

345445021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 607678.

The product of its (nonzero) digits is 9600, while the sum is 28.

The square root of 345445021 is about 18586.1513229609. The cubic root of 345445021 is about 701.6593430276.

Adding to 345445021 its reverse (120544543), we get a palindrome (465989564).

The spelling of 345445021 in words is "three hundred forty-five million, four hundred forty-five thousand, twenty-one".