3420305440021 has 4 divisors (see below), whose sum is σ = 3423597361600. Its totient is φ = 3417013518444.

The previous prime is 3420305440009. The next prime is 3420305440049. The reversal of 3420305440021 is 1200445030243.

It is a happy number.

3420305440021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 a de Polignac number, because none of the positive numbers 2^k-3420305440021 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 (3420305440621) 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, 1645959231 + ... + 1645961308.

It is an arithmetic number, because the mean of its divisors is an integer number (855899340400).

Almost surely, 2^{3420305440021} is an apocalyptic number.

It is an amenable number.

3420305440021 is a deficient number, since it is larger than the sum of its proper divisors (3291921579).

3420305440021 is a wasteful number, since it uses less digits than its factorization.

3420305440021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3291921578.

The product of its (nonzero) digits is 11520, while the sum is 28.

The spelling of 3420305440021 in words is "three trillion, four hundred twenty billion, three hundred five million, four hundred forty thousand, twenty-one".