20203211231221 has 8 divisors (see below), whose sum is σ = 20981196160920. Its totient is φ = 19430647799808.

The previous prime is 20203211231213. The next prime is 20203211231257. The reversal of 20203211231221 is 12213211230202.

It can be written as a sum of positive squares in 4 ways, for example, as 2837071978321 + 17366139252900 = 1684361^2 + 4167270^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20203211231221 - 2³ = 20203211231213 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20203211231192 and 20203211231201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20203211231821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1355366976 + ... + 1355381881.

It is an arithmetic number, because the mean of its divisors is an integer number (2622649520115).

Almost surely, 2^{20203211231221} is an apocalyptic number.

It is an amenable number.

20203211231221 is a deficient number, since it is larger than the sum of its proper divisors (777984929699).

20203211231221 is a wasteful number, since it uses less digits than its factorization.

20203211231221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2710749143.

The product of its (nonzero) digits is 576, while the sum is 22.

Adding to 20203211231221 its reverse (12213211230202), we get a palindrome (32416422461423).

The spelling of 20203211231221 in words is "twenty trillion, two hundred three billion, two hundred eleven million, two hundred thirty-one thousand, two hundred twenty-one".