20001221304 has 32 divisors (see below), whose sum is σ = 50020312320. Its totient is φ = 6664772576.

The previous prime is 20001221299. The next prime is 20001221311. The reversal of 20001221304 is 40312210002.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 72114 + ... + 212609.

It is an arithmetic number, because the mean of its divisors is an integer number (1563134760).

Almost surely, 2^20001221304 is an apocalyptic number.

20001221304 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

20001221304 is an abundant number, since it is smaller than the sum of its proper divisors (30019091016).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20001221304 is a wasteful number, since it uses less digits than its factorization.

20001221304 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 287659 (or 287655 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 15.

Adding to 20001221304 its reverse (40312210002), we get a palindrome (60313431306).

The spelling of 20001221304 in words is "twenty billion, one million, two hundred twenty-one thousand, three hundred four".