3445971843821 has 4 divisors (see below), whose sum is σ = 3711046601052. Its totient is φ = 3180897086592.

The previous prime is 3445971843817. The next prime is 3445971843833. The reversal of 3445971843821 is 1283481795443.

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 1336477035721 + 2109494808100 = 1156061^2 + 1452410^2 .

It is a cyclic number.

It is not a de Polignac number, because 3445971843821 - 2² = 3445971843817 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 (3445971843851) 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, 132537378596 + ... + 132537378621.

It is an arithmetic number, because the mean of its divisors is an integer number (927761650263).

Almost surely, 2^{3445971843821} is an apocalyptic number.

It is an amenable number.

3445971843821 is a deficient number, since it is larger than the sum of its proper divisors (265074757231).

3445971843821 is a wasteful number, since it uses less digits than its factorization.

3445971843821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 265074757230.

The product of its digits is 23224320, while the sum is 59.

The spelling of 3445971843821 in words is "three trillion, four hundred forty-five billion, nine hundred seventy-one million, eight hundred forty-three thousand, eight hundred twenty-one".