21020110303 has 16 divisors (see below), whose sum is σ = 21551152896. Its totient is φ = 20497126720.

The previous prime is 21020110289. The next prime is 21020110327. The reversal of 21020110303 is 30301102012.

It is a cyclic number.

It is not a de Polignac number, because 21020110303 - 2¹⁷ = 21019979231 is a prime.

It is a super-3 number, since 3×21020110303³ (a number of 32 digits) contains 333 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 (21020111303) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2491350 + ... + 2499772.

It is an arithmetic number, because the mean of its divisors is an integer number (1346947056).

Almost surely, 2^21020110303 is an apocalyptic number.

21020110303 is a deficient number, since it is larger than the sum of its proper divisors (531042593).

21020110303 is a wasteful number, since it uses less digits than its factorization.

21020110303 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8894.

The product of its (nonzero) digits is 36, while the sum is 13.

Adding to 21020110303 its reverse (30301102012), we get a palindrome (51321212315).

The spelling of 21020110303 in words is "twenty-one billion, twenty million, one hundred ten thousand, three hundred three".