345143021 has 4 divisors (see below), whose sum is σ = 349512000. Its totient is φ = 340774044.

The previous prime is 345143017. The next prime is 345143023. The reversal of 345143021 is 120341543.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 345143021 - 2² = 345143017 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 (345143023) 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, 2184371 + ... + 2184528.

It is an arithmetic number, because the mean of its divisors is an integer number (87378000).

Almost surely, 2^345143021 is an apocalyptic number.

It is an amenable number.

345143021 is a deficient number, since it is larger than the sum of its proper divisors (4368979).

345143021 is an equidigital number, since it uses as much as digits as its factorization.

345143021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4368978.

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

The square root of 345143021 is about 18578.0252179827. The cubic root of 345143021 is about 701.4548117813.

Adding to 345143021 its reverse (120341543), we get a palindrome (465484564).

The spelling of 345143021 in words is "three hundred forty-five million, one hundred forty-three thousand, twenty-one".