20111201122221 has 32 divisors (see below), whose sum is σ = 32503344076800. Its totient is φ = 12188459453040.

The previous prime is 20111201122217. The next prime is 20111201122253. The reversal of 20111201122221 is 12222110211102.

20111201122221 is a `hidden beast` number, since 201 + 1 + 120 + 1 + 122 + 221 = 666.

It is not a de Polignac number, because 20111201122221 - 2² = 20111201122217 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20111201122194 and 20111201122203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20111201122261) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 27383020 + ... + 28107866.

It is an arithmetic number, because the mean of its divisors is an integer number (1015729502400).

Almost surely, 2^{20111201122221} is an apocalyptic number.

It is an amenable number.

20111201122221 is a deficient number, since it is larger than the sum of its proper divisors (12392142954579).

20111201122221 is a wasteful number, since it uses less digits than its factorization.

20111201122221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 818286 (or 818280 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 20111201122221 its reverse (12222110211102), we get a palindrome (32333311333323).

The spelling of 20111201122221 in words is "twenty trillion, one hundred eleven billion, two hundred one million, one hundred twenty-two thousand, two hundred twenty-one".