21365034711503 has 8 divisors (see below), whose sum is σ = 25204833576960. Its totient is φ = 17722148608440.

The previous prime is 21365034711487. The next prime is 21365034711511. The reversal of 21365034711503 is 30511743056312.

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 21365034711503 - 2⁴ = 21365034711487 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 (21365034711533) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49228190363 + ... + 49228190796.

It is an arithmetic number, because the mean of its divisors is an integer number (3150604197120).

Almost surely, 2^{21365034711503} is an apocalyptic number.

21365034711503 is a deficient number, since it is larger than the sum of its proper divisors (3839798865457).

21365034711503 is an equidigital number, since it uses as much as digits as its factorization.

21365034711503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98456381197.

The product of its (nonzero) digits is 226800, while the sum is 41.

Adding to 21365034711503 its reverse (30511743056312), we get a palindrome (51876777767815).

The spelling of 21365034711503 in words is "twenty-one trillion, three hundred sixty-five billion, thirty-four million, seven hundred eleven thousand, five hundred three".