20120112221 has 32 divisors (see below), whose sum is σ = 23544743040. Its totient is φ = 16991078400.

The previous prime is 20120112211. The next prime is 20120112277. The reversal of 20120112221 is 12221102102.

It is not a de Polignac number, because 20120112221 - 2¹⁰ = 20120111197 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20120112196 and 20120112205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20120112211) 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, 4634870 + ... + 4639208.

It is an arithmetic number, because the mean of its divisors is an integer number (735773220).

Almost surely, 2^20120112221 is an apocalyptic number.

It is an amenable number.

20120112221 is a deficient number, since it is larger than the sum of its proper divisors (3424630819).

20120112221 is a wasteful number, since it uses less digits than its factorization.

20120112221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4685.

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

Adding to 20120112221 its reverse (12221102102), we get a palindrome (32341214323).

The spelling of 20120112221 in words is "twenty billion, one hundred twenty million, one hundred twelve thousand, two hundred twenty-one".