21020120303 has 48 divisors (see below), whose sum is σ = 26899750080. Its totient is φ = 16277184000.

The previous prime is 21020120243. The next prime is 21020120327. The reversal of 21020120303 is 30302102012.

It is a happy number.

It is not a de Polignac number, because 21020120303 - 2⁶ = 21020120239 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21020120333) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 5724158 + ... + 5727828.

It is an arithmetic number, because the mean of its divisors is an integer number (560411460).

Almost surely, 2^21020120303 is an apocalyptic number.

21020120303 is a deficient number, since it is larger than the sum of its proper divisors (5879629777).

21020120303 is a wasteful number, since it uses less digits than its factorization.

21020120303 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3888 (or 3881 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 14.

Adding to 21020120303 its reverse (30302102012), we get a palindrome (51322222315).

The spelling of 21020120303 in words is "twenty-one billion, twenty million, one hundred twenty thousand, three hundred three".