20203301221 has 4 divisors (see below), whose sum is σ = 20278406700. Its totient is φ = 20128195744.

The previous prime is 20203301207. The next prime is 20203301233. The reversal of 20203301221 is 12210330202.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3143284225 + 17060016996 = 56065^2 + 130614^2 .

It is a cyclic number.

It is not a de Polignac number, because 20203301221 - 2¹¹ = 20203299173 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20203301195 and 20203301204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20203301281) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37552336 + ... + 37552873.

It is an arithmetic number, because the mean of its divisors is an integer number (5069601675).

Almost surely, 2^20203301221 is an apocalyptic number.

It is an amenable number.

20203301221 is a deficient number, since it is larger than the sum of its proper divisors (75105479).

20203301221 is an equidigital number, since it uses as much as digits as its factorization.

20203301221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75105478.

The product of its (nonzero) digits is 144, while the sum is 16.

Adding to 20203301221 its reverse (12210330202), we get a palindrome (32413631423).

The spelling of 20203301221 in words is "twenty billion, two hundred three million, three hundred one thousand, two hundred twenty-one".