3420021 has 16 divisors (see below), whose sum is σ = 5110848. Its totient is φ = 2016000.

The previous prime is 3419963. The next prime is 3420023. The reversal of 3420021 is 1200243.

It is not a de Polignac number, because 3420021 - 2⁶ = 3419957 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 3419979 and 3420006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3420023) 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, 180 + ... + 2621.

It is an arithmetic number, because the mean of its divisors is an integer number (319428).

Almost surely, 2^3420021 is an apocalyptic number.

It is an amenable number.

3420021 is a deficient number, since it is larger than the sum of its proper divisors (1690827).

3420021 is a wasteful number, since it uses less digits than its factorization.

3420021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2852.

The product of its (nonzero) digits is 48, while the sum is 12.

The square root of 3420021 is about 1849.3298786317. The cubic root of 3420021 is about 150.6640338338.

Adding to 3420021 its reverse (1200243), we get a palindrome (4620264).

It can be divided in two parts, 3 and 420021, that added together give a palindrome (420024).

The spelling of 3420021 in words is "three million, four hundred twenty thousand, twenty-one".