641044021413 has 4 divisors (see below), whose sum is σ = 854725361888. Its totient is φ = 427362680940.

The previous prime is 641044021379. The next prime is 641044021451. The reversal of 641044021413 is 314120440146.

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 641044021413 - 2⁶ = 641044021349 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641044021463) 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, 106840670233 + ... + 106840670238.

It is an arithmetic number, because the mean of its divisors is an integer number (213681340472).

Almost surely, 2^641044021413 is an apocalyptic number.

It is an amenable number.

641044021413 is a deficient number, since it is larger than the sum of its proper divisors (213681340475).

641044021413 is a wasteful number, since it uses less digits than its factorization.

641044021413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213681340474.

The product of its (nonzero) digits is 9216, while the sum is 30.

Adding to 641044021413 its reverse (314120440146), we get a palindrome (955164461559).

The spelling of 641044021413 in words is "six hundred forty-one billion, forty-four million, twenty-one thousand, four hundred thirteen".