3420640321 has 4 divisors (see below), whose sum is σ = 3909303232. Its totient is φ = 2931977412.

The previous prime is 3420640309. The next prime is 3420640361. The reversal of 3420640321 is 1230460243.

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 de Polignac number, because none of the positive numbers 2^k-3420640321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3420640361) 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, 244331445 + ... + 244331458.

It is an arithmetic number, because the mean of its divisors is an integer number (977325808).

Almost surely, 2^3420640321 is an apocalyptic number.

It is an amenable number.

3420640321 is a deficient number, since it is larger than the sum of its proper divisors (488662911).

3420640321 is an equidigital number, since it uses as much as digits as its factorization.

3420640321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 488662910.

The product of its (nonzero) digits is 3456, while the sum is 25.

The square root of 3420640321 is about 58486.2404416629. The cubic root of 3420640321 is about 1506.7312771248.

The spelling of 3420640321 in words is "three billion, four hundred twenty million, six hundred forty thousand, three hundred twenty-one".