212220001022121 has 6 divisors (see below), whose sum is σ = 306540001476410. Its totient is φ = 141480000681408.

The previous prime is 212220001022027. The next prime is 212220001022173. The reversal of 212220001022121 is 121220100022212.

It is a happy number.

212220001022121 is a `hidden beast` number, since 212 + 2 + 200 + 0 + 10 + 221 + 21 = 666.

It can be written as a sum of positive squares in only one way, i.e., 154424488365225 + 57795512656896 = 12426765^2 + 7602336^2 .

It is not a de Polignac number, because 212220001022121 - 2²⁵ = 212219967467689 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212220001022094 and 212220001022103.

It is not an unprimeable number, because it can be changed into a prime (212220001022021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11790000056776 + ... + 11790000056793.

Almost surely, 2^{212220001022121} is an apocalyptic number.

It is an amenable number.

212220001022121 is a deficient number, since it is larger than the sum of its proper divisors (94320000454289).

212220001022121 is a wasteful number, since it uses less digits than its factorization.

212220001022121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23580000113575 (or 23580000113572 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 212220001022121 its reverse (121220100022212), we get a palindrome (333440101044333).

Subtracting from 212220001022121 its reverse (121220100022212), we obtain a palindrome (90999900999909).

The spelling of 212220001022121 in words is "two hundred twelve trillion, two hundred twenty billion, one million, twenty-two thousand, one hundred twenty-one".