20110112221 has 4 divisors (see below), whose sum is σ = 21168539200. Its totient is φ = 19051685244.

The previous prime is 20110112153. The next prime is 20110112227. The reversal of 20110112221 is 12221101102.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 20110112221 - 2¹⁵ = 20110079453 is a prime.

It is a super-2 number, since 2×20110112221² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20110112227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 529213461 + ... + 529213498.

It is an arithmetic number, because the mean of its divisors is an integer number (5292134800).

Almost surely, 2^20110112221 is an apocalyptic number.

It is an amenable number.

20110112221 is a deficient number, since it is larger than the sum of its proper divisors (1058426979).

20110112221 is a wasteful number, since it uses less digits than its factorization.

20110112221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1058426978.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 20110112221 its reverse (12221101102), we get a palindrome (32331213323).

The spelling of 20110112221 in words is "twenty billion, one hundred ten million, one hundred twelve thousand, two hundred twenty-one".