20001221303 has 16 divisors (see below), whose sum is σ = 23002856256. Its totient is φ = 17035868160.

The previous prime is 20001221299. The next prime is 20001221311. The reversal of 20001221303 is 30312210002.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 20001221303 - 2² = 20001221299 is a prime.

It is a super-2 number, since 2×20001221303² (a number of 21 digits) contains 22 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 (20001121303) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1263425 + ... + 1279157.

It is an arithmetic number, because the mean of its divisors is an integer number (1437678516).

Almost surely, 2^20001221303 is an apocalyptic number.

20001221303 is a deficient number, since it is larger than the sum of its proper divisors (3001634953).

20001221303 is a wasteful number, since it uses less digits than its factorization.

20001221303 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16874.

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

Adding to 20001221303 its reverse (30312210002), we get a palindrome (50313431305).

The spelling of 20001221303 in words is "twenty billion, one million, two hundred twenty-one thousand, three hundred three".