21161002315603 has 4 divisors (see below), whose sum is σ = 21653118648568. Its totient is φ = 20668885982640.

The previous prime is 21161002315571. The next prime is 21161002315637. The reversal of 21161002315603 is 30651320016112.

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 21161002315603 - 2⁵ = 21161002315571 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21161002315403) 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, 246058166418 + ... + 246058166503.

It is an arithmetic number, because the mean of its divisors is an integer number (5413279662142).

Almost surely, 2^{21161002315603} is an apocalyptic number.

21161002315603 is a deficient number, since it is larger than the sum of its proper divisors (492116332965).

21161002315603 is an equidigital number, since it uses as much as digits as its factorization.

21161002315603 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 492116332964.

The product of its (nonzero) digits is 6480, while the sum is 31.

The spelling of 21161002315603 in words is "twenty-one trillion, one hundred sixty-one billion, two million, three hundred fifteen thousand, six hundred three".