20010212122221 has 12 divisors (see below), whose sum is σ = 28904916069120. Its totient is φ = 13339552336200.

The previous prime is 20010212122217. The next prime is 20010212122259. The reversal of 20010212122221 is 12222121201002.

It is a happy number.

20010212122221 is a `hidden beast` number, since 200 + 10 + 21 + 212 + 2 + 221 = 666.

It is not a de Polignac number, because 20010212122221 - 2² = 20010212122217 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20010212122194 and 20010212122203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20010212123221) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 48874701 + ... + 49282418.

It is an arithmetic number, because the mean of its divisors is an integer number (2408743005760).

Almost surely, 2^{20010212122221} is an apocalyptic number.

It is an amenable number.

20010212122221 is a deficient number, since it is larger than the sum of its proper divisors (8894703946899).

20010212122221 is a wasteful number, since it uses less digits than its factorization.

20010212122221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98179776 (or 98179773 counting only the distinct ones).

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

Adding to 20010212122221 its reverse (12222121201002), we get a palindrome (32232333323223).

The spelling of 20010212122221 in words is "twenty trillion, ten billion, two hundred twelve million, one hundred twenty-two thousand, two hundred twenty-one".