20010212212221 has 80 divisors (see below), whose sum is σ = 37535811371520. Its totient is φ = 10320131423520.

The previous prime is 20010212212163. The next prime is 20010212212241. The reversal of 20010212212221 is 12221221201002.

It is a happy number.

20010212212221 is a `hidden beast` number, since 20 + 0 + 1 + 0 + 212 + 212 + 221 = 666.

It is not a de Polignac number, because 20010212212221 - 2⁹ = 20010212211709 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20010212212194 and 20010212212203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20010212212241) 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 79 ways as a sum of consecutive naturals, for example, 10673731 + ... + 12407616.

It is an arithmetic number, because the mean of its divisors is an integer number (469197642144).

Almost surely, 2^{20010212212221} is an apocalyptic number.

20010212212221 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

20010212212221 is a deficient number, since it is larger than the sum of its proper divisors (17525599159299).

20010212212221 is a wasteful number, since it uses less digits than its factorization.

20010212212221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23081516 (or 23081507 counting only the distinct ones).

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

Adding to 20010212212221 its reverse (12221221201002), we get a palindrome (32231433413223).

The spelling of 20010212212221 in words is "twenty trillion, ten billion, two hundred twelve million, two hundred twelve thousand, two hundred twenty-one".