20011112122221 has 24 divisors (see below), whose sum is σ = 32700537883104. Its totient is φ = 12127946739120.

The previous prime is 20011112122213. The next prime is 20011112122241. The reversal of 20011112122221 is 12222121111002.

20011112122221 is a `hidden beast` number, since 200 + 11 + 112 + 122 + 221 = 666.

It is not a de Polignac number, because 20011112122221 - 2³ = 20011112122213 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20011112122194 and 20011112122203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20011112122241) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3743190766 + ... + 3743196111.

It is an arithmetic number, because the mean of its divisors is an integer number (1362522411796).

Almost surely, 2^{20011112122221} is an apocalyptic number.

It is an amenable number.

20011112122221 is a deficient number, since it is larger than the sum of its proper divisors (12689425760883).

20011112122221 is an equidigital number, since it uses as much as digits as its factorization.

20011112122221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7486386903 (or 7486386891 counting only the distinct ones).

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

Adding to 20011112122221 its reverse (12222121111002), we get a palindrome (32233233233223).

The spelling of 20011112122221 in words is "twenty trillion, eleven billion, one hundred twelve million, one hundred twenty-two thousand, two hundred twenty-one".