20212010122221 has 6 divisors (see below), whose sum is σ = 29195125732110. Its totient is φ = 13474673414808.

The previous prime is 20212010122217. The next prime is 20212010122243. The reversal of 20212010122221 is 12222101021202.

It is a happy number.

20212010122221 is a `hidden beast` number, since 202 + 120 + 1 + 0 + 122 + 221 = 666.

It can be written as a sum of positive squares in only one way, i.e., 15537826658025 + 4674183464196 = 3941805^2 + 2161986^2 .

It is not a de Polignac number, because 20212010122221 - 2² = 20212010122217 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20212010122194 and 20212010122203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20212000122221) 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 5 ways as a sum of consecutive naturals, for example, 1122889451226 + ... + 1122889451243.

It is an arithmetic number, because the mean of its divisors is an integer number (4865854288685).

Almost surely, 2^{20212010122221} is an apocalyptic number.

It is an amenable number.

20212010122221 is a deficient number, since it is larger than the sum of its proper divisors (8983115609889).

20212010122221 is a wasteful number, since it uses less digits than its factorization.

20212010122221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2245778902475 (or 2245778902472 counting only the distinct ones).

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

Adding to 20212010122221 its reverse (12222101021202), we get a palindrome (32434111143423).

The spelling of 20212010122221 in words is "twenty trillion, two hundred twelve billion, ten million, one hundred twenty-two thousand, two hundred twenty-one".