20212110121221 has 12 divisors (see below), whose sum is σ = 29673881162380. Its totient is φ = 13253842702080.

The previous prime is 20212110121157. The next prime is 20212110121237. The reversal of 20212110121221 is 12212101121202.

20212110121221 is a `hidden beast` number, since 2 + 0 + 212 + 110 + 121 + 221 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 2842970304321 + 17369139816900 = 1686111^2 + 4167630^2 .

It is not a de Polignac number, because 20212110121221 - 2⁶ = 20212110121157 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20212110121194 and 20212110121203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20212110121121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18408114316 + ... + 18408115413.

Almost surely, 2^{20212110121221} is an apocalyptic number.

It is an amenable number.

20212110121221 is a deficient number, since it is larger than the sum of its proper divisors (9461771041159).

20212110121221 is a wasteful number, since it uses less digits than its factorization.

20212110121221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36816229796 (or 36816229793 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 20212110121221 its reverse (12212101121202), we get a palindrome (32424211242423).

The spelling of 20212110121221 in words is "twenty trillion, two hundred twelve billion, one hundred ten million, one hundred twenty-one thousand, two hundred twenty-one".