3420020321 has 4 divisors (see below), whose sum is σ = 3429547200. Its totient is φ = 3410493444.

The previous prime is 3420020309. The next prime is 3420020369. The reversal of 3420020321 is 1230200243.

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 3420020321 - 2¹⁰ = 3420019297 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 3420020321.

It is not an unprimeable number, because it can be changed into a prime (3420020621) 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, 4762901 + ... + 4763618.

It is an arithmetic number, because the mean of its divisors is an integer number (857386800).

Almost surely, 2^3420020321 is an apocalyptic number.

It is an amenable number.

3420020321 is a deficient number, since it is larger than the sum of its proper divisors (9526879).

3420020321 is an equidigital number, since it uses as much as digits as its factorization.

3420020321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9526878.

The product of its (nonzero) digits is 288, while the sum is 17.

The square root of 3420020321 is about 58480.9398094798. The cubic root of 3420020321 is about 1506.6402386300.

Adding to 3420020321 its reverse (1230200243), we get a palindrome (4650220564).

The spelling of 3420020321 in words is "three billion, four hundred twenty million, twenty thousand, three hundred twenty-one".