21202012303 has 4 divisors (see below), whose sum is σ = 21270186288. Its totient is φ = 21133838320.

The previous prime is 21202012301. The next prime is 21202012327. The reversal of 21202012303 is 30321020212.

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 21202012303 - 2¹ = 21202012301 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 (21202012301) 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, 34086526 + ... + 34087147.

It is an arithmetic number, because the mean of its divisors is an integer number (5317546572).

Almost surely, 2^21202012303 is an apocalyptic number.

21202012303 is a deficient number, since it is larger than the sum of its proper divisors (68173985).

21202012303 is an equidigital number, since it uses as much as digits as its factorization.

21202012303 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68173984.

The product of its (nonzero) digits is 144, while the sum is 16.

Adding to 21202012303 its reverse (30321020212), we get a palindrome (51523032515).

The spelling of 21202012303 in words is "twenty-one billion, two hundred two million, twelve thousand, three hundred three".