20212131113221 has 8 divisors (see below), whose sum is σ = 21428765760024. Its totient is φ = 18998572661760.

The previous prime is 20212131113173. The next prime is 20212131113287. The reversal of 20212131113221 is 12231113121202.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 3050747796321 + 17161383316900 = 1746639^2 + 4142630^2 .

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 20212131113221 - 2¹⁷ = 20212130982149 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20212131113192 and 20212131113201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20212131113521) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 769035300 + ... + 769061581.

It is an arithmetic number, because the mean of its divisors is an integer number (2678595720003).

Almost surely, 2^{20212131113221} is an apocalyptic number.

It is an amenable number.

20212131113221 is a deficient number, since it is larger than the sum of its proper divisors (1216634646803).

20212131113221 is a wasteful number, since it uses less digits than its factorization.

20212131113221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1538097671.

The product of its (nonzero) digits is 288, while the sum is 22.

Adding to 20212131113221 its reverse (12231113121202), we get a palindrome (32443244234423).

The spelling of 20212131113221 in words is "twenty trillion, two hundred twelve billion, one hundred thirty-one million, one hundred thirteen thousand, two hundred twenty-one".