3813264307821 has 4 divisors (see below), whose sum is σ = 5084352410432. Its totient is φ = 2542176205212.

The previous prime is 3813264307817. The next prime is 3813264307841. The reversal of 3813264307821 is 1287034623183.

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 not a de Polignac number, because 3813264307821 - 2² = 3813264307817 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 (3813264307841) 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, 635544051301 + ... + 635544051306.

It is an arithmetic number, because the mean of its divisors is an integer number (1271088102608).

Almost surely, 2^{3813264307821} is an apocalyptic number.

It is an amenable number.

3813264307821 is a deficient number, since it is larger than the sum of its proper divisors (1271088102611).

3813264307821 is a wasteful number, since it uses less digits than its factorization.

3813264307821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1271088102610.

The product of its (nonzero) digits is 1161216, while the sum is 48.

The spelling of 3813264307821 in words is "three trillion, eight hundred thirteen billion, two hundred sixty-four million, three hundred seven thousand, eight hundred twenty-one".