6442103621 has 4 divisors (see below), whose sum is σ = 6446538732. Its totient is φ = 6437668512.

The previous prime is 6442103579. The next prime is 6442103651. The reversal of 6442103621 is 1263012446.

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 6129167521 + 312936100 = 78289^2 + 17690^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6442103621 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 (6442103651) 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, 2215376 + ... + 2218281.

It is an arithmetic number, because the mean of its divisors is an integer number (1611634683).

Almost surely, 2^6442103621 is an apocalyptic number.

It is an amenable number.

6442103621 is a deficient number, since it is larger than the sum of its proper divisors (4435111).

6442103621 is a wasteful number, since it uses less digits than its factorization.

6442103621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4435110.

The product of its (nonzero) digits is 6912, while the sum is 29.

The square root of 6442103621 is about 80262.7162573009. The cubic root of 6442103621 is about 1860.6980481064.

The spelling of 6442103621 in words is "six billion, four hundred forty-two million, one hundred three thousand, six hundred twenty-one".