20100112221 has 16 divisors (see below), whose sum is σ = 30630939264. Its totient is φ = 11484954624.

The previous prime is 20100112213. The next prime is 20100112237. The reversal of 20100112221 is 12221100102.

It is not a de Polignac number, because 20100112221 - 2³ = 20100112213 is a prime.

It is a super-2 number, since 2×20100112221² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20100112197 and 20100112206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20100112421) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 384001 + ... + 433193.

It is an arithmetic number, because the mean of its divisors is an integer number (1914433704).

Almost surely, 2^20100112221 is an apocalyptic number.

20100112221 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

20100112221 is a deficient number, since it is larger than the sum of its proper divisors (10530827043).

20100112221 is a wasteful number, since it uses less digits than its factorization.

20100112221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68660.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 20100112221 its reverse (12221100102), we get a palindrome (32321212323).

The spelling of 20100112221 in words is "twenty billion, one hundred million, one hundred twelve thousand, two hundred twenty-one".