20112012221 has 12 divisors (see below), whose sum is σ = 24626954880. Its totient is φ = 16331558040.

The previous prime is 20112012209. The next prime is 20112012251. The reversal of 20112012221 is 12221021102.

It is a de Polignac number, because none of the positive numbers 2^k-20112012221 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20112012196 and 20112012205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20112012251) 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, 10800365 + ... + 10802226.

It is an arithmetic number, because the mean of its divisors is an integer number (2052246240).

Almost surely, 2^20112012221 is an apocalyptic number.

It is an amenable number.

20112012221 is a deficient number, since it is larger than the sum of its proper divisors (4514942659).

20112012221 is a wasteful number, since it uses less digits than its factorization.

20112012221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21602624 (or 21602617 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 20112012221 its reverse (12221021102), we get a palindrome (32333033323).

The spelling of 20112012221 in words is "twenty billion, one hundred twelve million, twelve thousand, two hundred twenty-one".