4043641621 has 4 divisors (see below), whose sum is σ = 4043768832. Its totient is φ = 4043514412.

The previous prime is 4043641549. The next prime is 4043641631. The reversal of 4043641621 is 1261463404.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 4043641621 - 2⁷ = 4043641493 is a prime.

It is a Smith number, since the sum of its digits (31) 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 (4043641631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29706 + ... + 94708.

It is an arithmetic number, because the mean of its divisors is an integer number (1010942208).

Almost surely, 2^4043641621 is an apocalyptic number.

It is an amenable number.

4043641621 is a deficient number, since it is larger than the sum of its proper divisors (127211).

4043641621 is an equidigital number, since it uses as much as digits as its factorization.

4043641621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127210.

The product of its (nonzero) digits is 13824, while the sum is 31.

The square root of 4043641621 is about 63589.6345405444. The cubic root of 4043641621 is about 1593.1532457490.

The spelling of 4043641621 in words is "four billion, forty-three million, six hundred forty-one thousand, six hundred twenty-one".