3420710021 has 4 divisors (see below), whose sum is σ = 3421520844. Its totient is φ = 3419899200.

The previous prime is 3420709997. The next prime is 3420710039. The reversal of 3420710021 is 1200170243.

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 2603550625 + 817159396 = 51025^2 + 28586^2 .

It is a cyclic number.

It is not a de Polignac number, because 3420710021 - 2²⁶ = 3353601157 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3420709975 and 3420710002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3420715021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 399050 + ... + 407531.

It is an arithmetic number, because the mean of its divisors is an integer number (855380211).

Almost surely, 2^3420710021 is an apocalyptic number.

It is an amenable number.

3420710021 is a deficient number, since it is larger than the sum of its proper divisors (810823).

3420710021 is an equidigital number, since it uses as much as digits as its factorization.

3420710021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 810822.

The product of its (nonzero) digits is 336, while the sum is 20.

The square root of 3420710021 is about 58486.8363052747. The cubic root of 3420710021 is about 1506.7415109258.

Adding to 3420710021 its reverse (1200170243), we get a palindrome (4620880264).

The spelling of 3420710021 in words is "three billion, four hundred twenty million, seven hundred ten thousand, twenty-one".