20203321221 has 12 divisors (see below), whose sum is σ = 30188871180. Its totient is φ = 13004436480.

The previous prime is 20203321213. The next prime is 20203321223. The reversal of 20203321221 is 12212330202.

It can be written as a sum of positive squares in 2 ways, for example, as 4449557025 + 15753764196 = 66705^2 + 125514^2 .

It is not a de Polignac number, because 20203321221 - 2³ = 20203321213 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20203321194 and 20203321203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20203321223) 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 11 ways as a sum of consecutive naturals, for example, 38703420 + ... + 38703941.

It is an arithmetic number, because the mean of its divisors is an integer number (2515739265).

Almost surely, 2^20203321221 is an apocalyptic number.

It is an amenable number.

20203321221 is a deficient number, since it is larger than the sum of its proper divisors (9985549959).

20203321221 is a wasteful number, since it uses less digits than its factorization.

20203321221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77407396 (or 77407393 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

Adding to 20203321221 its reverse (12212330202), we get a palindrome (32415651423).

The spelling of 20203321221 in words is "twenty billion, two hundred three million, three hundred twenty-one thousand, two hundred twenty-one".