2221100121 has 16 divisors (see below), whose sum is σ = 3139624448. Its totient is φ = 1394236800.

The previous prime is 2221100081. The next prime is 2221100129. The reversal of 2221100121 is 1210011222.

It is not a de Polignac number, because 2221100121 - 2¹⁴ = 2221083737 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2221100097 and 2221100106.

It is not an unprimeable number, because it can be changed into a prime (2221100129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 319300 + ... + 326181.

It is an arithmetic number, because the mean of its divisors is an integer number (196226528).

Almost surely, 2^2221100121 is an apocalyptic number.

It is an amenable number.

2221100121 is a deficient number, since it is larger than the sum of its proper divisors (918524327).

2221100121 is a wasteful number, since it uses less digits than its factorization.

2221100121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 645552.

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

The square root of 2221100121 is about 47128.5488955474. The cubic root of 2221100121 is about 1304.7361995216.

Adding to 2221100121 its reverse (1210011222), we get a palindrome (3431111343).

The spelling of 2221100121 in words is "two billion, two hundred twenty-one million, one hundred thousand, one hundred twenty-one".