21631604320103 has 4 divisors (see below), whose sum is σ = 21693943237800. Its totient is φ = 21569265402408.

The previous prime is 21631604320091. The next prime is 21631604320141. The reversal of 21631604320103 is 30102340613612.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21631604320103 - 2²⁰ = 21631603271527 is a prime.

It is a super-2 number, since 2×21631604320103² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21631604320103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21631604520103) 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, 31169458328 + ... + 31169459021.

It is an arithmetic number, because the mean of its divisors is an integer number (5423485809450).

Almost surely, 2^{21631604320103} is an apocalyptic number.

21631604320103 is a deficient number, since it is larger than the sum of its proper divisors (62338917697).

21631604320103 is an equidigital number, since it uses as much as digits as its factorization.

21631604320103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62338917696.

The product of its (nonzero) digits is 15552, while the sum is 32.

Adding to 21631604320103 its reverse (30102340613612), we get a palindrome (51733944933715).

The spelling of 21631604320103 in words is "twenty-one trillion, six hundred thirty-one billion, six hundred four million, three hundred twenty thousand, one hundred three".