345513021 has 16 divisors (see below), whose sum is σ = 531712128. Its totient is φ = 195480000.

The previous prime is 345513019. The next prime is 345513023. The reversal of 345513021 is 120315543.

It is an interprime number because it is at equal distance from previous prime (345513019) and next prime (345513023).

It is not a de Polignac number, because 345513021 - 2¹ = 345513019 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 345512982 and 345513000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (345513023) 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, 79330 + ... + 83571.

It is an arithmetic number, because the mean of its divisors is an integer number (33232008).

Almost surely, 2^345513021 is an apocalyptic number.

It is an amenable number.

345513021 is a deficient number, since it is larger than the sum of its proper divisors (186199107).

345513021 is a wasteful number, since it uses less digits than its factorization.

345513021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163012.

The product of its (nonzero) digits is 1800, while the sum is 24.

The square root of 345513021 is about 18587.9805519588. The cubic root of 345513021 is about 701.7053799771.

Adding to 345513021 its reverse (120315543), we get a palindrome (465828564).

The spelling of 345513021 in words is "three hundred forty-five million, five hundred thirteen thousand, twenty-one".