3445670821 has 4 divisors (see below), whose sum is σ = 3510683532. Its totient is φ = 3380658112.

The previous prime is 3445670803. The next prime is 3445670903. The reversal of 3445670821 is 1280765443.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1280765443 = 521 ⋅2458283.

It can be written as a sum of positive squares in 2 ways, for example, as 1300684225 + 2144986596 = 36065^2 + 46314^2 .

It is a cyclic number.

It is not a de Polignac number, because 3445670821 - 2¹¹ = 3445668773 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3445670321) 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, 32506276 + ... + 32506381.

It is an arithmetic number, because the mean of its divisors is an integer number (877670883).

Almost surely, 2^3445670821 is an apocalyptic number.

It is an amenable number.

3445670821 is a deficient number, since it is larger than the sum of its proper divisors (65012711).

3445670821 is an equidigital number, since it uses as much as digits as its factorization.

3445670821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65012710.

The product of its (nonzero) digits is 161280, while the sum is 40.

The square root of 3445670821 is about 58699.8366352071. The cubic root of 3445670821 is about 1510.3975125541.

The spelling of 3445670821 in words is "three billion, four hundred forty-five million, six hundred seventy thousand, eight hundred twenty-one".