20010212221221 has 12 divisors (see below), whose sum is σ = 29080962821248. Its totient is φ = 13258300121064.

The previous prime is 20010212221201. The next prime is 20010212221229. The reversal of 20010212221221 is 12212221201002.

It is a happy number.

20010212221221 is a `hidden beast` number, since 2 + 0 + 0 + 10 + 212 + 221 + 221 = 666.

It is not a de Polignac number, because 20010212221221 - 2⁹ = 20010212220709 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20010212221194 and 20010212221203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20010212221229) 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, 6820111765 + ... + 6820114698.

Almost surely, 2^{20010212221221} is an apocalyptic number.

It is an amenable number.

20010212221221 is a deficient number, since it is larger than the sum of its proper divisors (9070750600027).

20010212221221 is a wasteful number, since it uses less digits than its factorization.

20010212221221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13640226632 (or 13640226629 counting only the distinct ones).

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

Adding to 20010212221221 its reverse (12212221201002), we get a palindrome (32222433422223).

The spelling of 20010212221221 in words is "twenty trillion, ten billion, two hundred twelve million, two hundred twenty-one thousand, two hundred twenty-one".