21220232303 has 4 divisors (see below), whose sum is σ = 22468481280. Its totient is φ = 19971983328.

The previous prime is 21220232291. The next prime is 21220232317. The reversal of 21220232303 is 30323202212.

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 21220232303 - 2⁴ = 21220232287 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 (21220232503) 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, 624124463 + ... + 624124496.

It is an arithmetic number, because the mean of its divisors is an integer number (5617120320).

Almost surely, 2^21220232303 is an apocalyptic number.

21220232303 is a deficient number, since it is larger than the sum of its proper divisors (1248248977).

21220232303 is a wasteful number, since it uses less digits than its factorization.

21220232303 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1248248976.

The product of its (nonzero) digits is 864, while the sum is 20.

Adding to 21220232303 its reverse (30323202212), we get a palindrome (51543434515).

The spelling of 21220232303 in words is "twenty-one billion, two hundred twenty million, two hundred thirty-two thousand, three hundred three".