21500003315003 has 4 divisors (see below), whose sum is σ = 21500059836840. Its totient is φ = 21499946793168.

The previous prime is 21500003314997. The next prime is 21500003315009. The reversal of 21500003315003 is 30051330000512.

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

It is an interprime number because it is at equal distance from previous prime (21500003314997) and next prime (21500003315009).

It is a cyclic number.

It is not a de Polignac number, because 21500003315003 - 2²⁶ = 21499936206139 is a prime.

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 21500003315003.

It is not an unprimeable number, because it can be changed into a prime (21500003315009) 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, 27686450 + ... + 28452407.

It is an arithmetic number, because the mean of its divisors is an integer number (5375014959210).

Almost surely, 2^{21500003315003} is an apocalyptic number.

21500003315003 is a deficient number, since it is larger than the sum of its proper divisors (56521837).

21500003315003 is an equidigital number, since it uses as much as digits as its factorization.

21500003315003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56521836.

The product of its (nonzero) digits is 1350, while the sum is 23.

Adding to 21500003315003 its reverse (30051330000512), we get a palindrome (51551333315515).

The spelling of 21500003315003 in words is "twenty-one trillion, five hundred billion, three million, three hundred fifteen thousand, three".