6621621103 has 4 divisors (see below), whose sum is σ = 6621787048. Its totient is φ = 6621455160.

The previous prime is 6621621089. The next prime is 6621621143. The reversal of 6621621103 is 3011261266.

6621621103 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, 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 6621621103 - 2⁹ = 6621620591 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 (6621621143) 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, 17173 + ... + 116353.

It is an arithmetic number, because the mean of its divisors is an integer number (1655446762).

Almost surely, 2^6621621103 is an apocalyptic number.

6621621103 is a deficient number, since it is larger than the sum of its proper divisors (165945).

6621621103 is an equidigital number, since it uses as much as digits as its factorization.

6621621103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165944.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 6621621103 is about 81373.3439339935. The cubic root of 6621621103 is about 1877.8235246318.

Adding to 6621621103 its reverse (3011261266), we get a palindrome (9632882369).

The spelling of 6621621103 in words is "six billion, six hundred twenty-one million, six hundred twenty-one thousand, one hundred three".