21613430303 has 4 divisors (see below), whose sum is σ = 22553144688. Its totient is φ = 20673715920.

The previous prime is 21613430197. The next prime is 21613430327. The reversal of 21613430303 is 30303431612.

It is a happy number.

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 21613430303 - 2¹⁶ = 21613364767 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 (21613460303) 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, 469857158 + ... + 469857203.

It is an arithmetic number, because the mean of its divisors is an integer number (5638286172).

Almost surely, 2^21613430303 is an apocalyptic number.

21613430303 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

21613430303 is a deficient number, since it is larger than the sum of its proper divisors (939714385).

21613430303 is an equidigital number, since it uses as much as digits as its factorization.

21613430303 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 939714384.

The product of its (nonzero) digits is 3888, while the sum is 26.

Adding to 21613430303 its reverse (30303431612), we get a palindrome (51916861915).

The spelling of 21613430303 in words is "twenty-one billion, six hundred thirteen million, four hundred thirty thousand, three hundred three".