21613805003 has 4 divisors (see below), whose sum is σ = 24701491440. Its totient is φ = 18526118568.

The previous prime is 21613804999. The next prime is 21613805021. The reversal of 21613805003 is 30050831612.

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 21613805003 - 2² = 21613804999 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21613805023) 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, 1543843208 + ... + 1543843221.

It is an arithmetic number, because the mean of its divisors is an integer number (6175372860).

Almost surely, 2^21613805003 is an apocalyptic number.

21613805003 is a deficient number, since it is larger than the sum of its proper divisors (3087686437).

21613805003 is an equidigital number, since it uses as much as digits as its factorization.

21613805003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3087686436.

The product of its (nonzero) digits is 4320, while the sum is 29.

The spelling of 21613805003 in words is "twenty-one billion, six hundred thirteen million, eight hundred five thousand, three".