21232310303 has 4 divisors (see below), whose sum is σ = 21236947728. Its totient is φ = 21227672880.

The previous prime is 21232310291. The next prime is 21232310311. The reversal of 21232310303 is 30301323212.

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 21232310303 - 2¹⁴ = 21232293919 is a prime.

It is a super-2 number, since 2×21232310303² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21232315303) 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, 2311838 + ... + 2321003.

It is an arithmetic number, because the mean of its divisors is an integer number (5309236932).

Almost surely, 2^21232310303 is an apocalyptic number.

21232310303 is a deficient number, since it is larger than the sum of its proper divisors (4637425).

21232310303 is an equidigital number, since it uses as much as digits as its factorization.

21232310303 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4637424.

The product of its (nonzero) digits is 648, while the sum is 20.

Adding to 21232310303 its reverse (30301323212), we get a palindrome (51533633515).

The spelling of 21232310303 in words is "twenty-one billion, two hundred thirty-two million, three hundred ten thousand, three hundred three".