20212221110121 has 18 divisors (see below), whose sum is σ = 30812905870890. Its totient is φ = 12765613330656.

The previous prime is 20212221110113. The next prime is 20212221110143. The reversal of 20212221110121 is 12101112221202.

20212221110121 is a `hidden beast` number, since 2 + 0 + 212 + 221 + 110 + 121 = 666.

It can be written as a sum of positive squares in only one way, i.e., 12906336466521 + 7305884643600 = 3592539^2 + 2702940^2 .

It is not a de Polignac number, because 20212221110121 - 2³ = 20212221110113 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20212221110094 and 20212221110103.

It is not an unprimeable number, because it can be changed into a prime (20212221110101) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 3110526316 + ... + 3110532813.

Almost surely, 2^{20212221110121} is an apocalyptic number.

It is an amenable number.

20212221110121 is a deficient number, since it is larger than the sum of its proper divisors (10600684760769).

20212221110121 is a wasteful number, since it uses less digits than its factorization.

20212221110121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6221059173 (or 6221059151 counting only the distinct ones).

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

Adding to 20212221110121 its reverse (12101112221202), we get a palindrome (32313333331323).

The spelling of 20212221110121 in words is "twenty trillion, two hundred twelve billion, two hundred twenty-one million, one hundred ten thousand, one hundred twenty-one".