21320120303 has 4 divisors (see below), whose sum is σ = 21508794048. Its totient is φ = 21131446560.

The previous prime is 21320120233. The next prime is 21320120329. The reversal of 21320120303 is 30302102312.

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 21320120303 - 2¹⁴ = 21320103919 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 (21320128303) 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, 94336703 + ... + 94336928.

It is an arithmetic number, because the mean of its divisors is an integer number (5377198512).

Almost surely, 2^21320120303 is an apocalyptic number.

21320120303 is a deficient number, since it is larger than the sum of its proper divisors (188673745).

21320120303 is a wasteful number, since it uses less digits than its factorization.

21320120303 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 188673744.

The product of its (nonzero) digits is 216, while the sum is 17.

Adding to 21320120303 its reverse (30302102312), we get a palindrome (51622222615).

The spelling of 21320120303 in words is "twenty-one billion, three hundred twenty million, one hundred twenty thousand, three hundred three".