7643041421 has 8 divisors (see below), whose sum is σ = 7772516664. Its totient is φ = 7513701120.

The previous prime is 7643041411. The next prime is 7643041423. The reversal of 7643041421 is 1241403467.

It can be written as a sum of positive squares in 4 ways, for example, as 645718921 + 6997322500 = 25411^2 + 83650^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 7643041421 - 2²⁶ = 7575932557 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 (7643041423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 83945 + ... + 149441.

It is an arithmetic number, because the mean of its divisors is an integer number (971564583).

Almost surely, 2^7643041421 is an apocalyptic number.

It is an amenable number.

7643041421 is a deficient number, since it is larger than the sum of its proper divisors (129475243).

7643041421 is a wasteful number, since it uses less digits than its factorization.

7643041421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67471.

The product of its (nonzero) digits is 16128, while the sum is 32.

The square root of 7643041421 is about 87424.4898240762. The cubic root of 7643041421 is about 1969.7997186170.

Adding to 7643041421 its reverse (1241403467), we get a palindrome (8884444888).

The spelling of 7643041421 in words is "seven billion, six hundred forty-three million, forty-one thousand, four hundred twenty-one".